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Divine gift of coding v.1.0 final public

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Fabrizio Cilli
Fabrizio Cilli

Pro Bono Speech Support Deck on: a Parallel between one of Renaissance's literature masterpieces secret Codes and modern Art of Coding and its Security implications. Copyright Note: All contents, trademarks, brands, models or designs of copyrighted materials are property of the respective copyright owner, please contact the author for removal, if inadvertently infringing it.

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IS CODING… …A DIVINE GIFT ? On how Dante Alighieri De-Coded and Re-Coded scriptures itself, to help diffuse a sustainable path to salvation ! The process of imaginification. https://fossbytes.com/stackgan-ai-text-to-image-conversion/ https://arxiv.org/pdf/1612.03242v1.pdf
A BRIEF INTRODUCTION ABOUT MYSELF: I’m THIS GUY here* -> YEAH… I REALLY DO ENJOY WORKING IN THE WOODS! https://it.linkedin.com/in/fabriziocilli www.linkedin.com/pulse/posts/fabriziocilli* I know… I look much better in the picture … 
A BRIEF INTRODUCTION ABOUT MYSELF: ! * Special Thanks: Mom and Dad. A not foreseeable amount of years of Happiness , Fulfillment and Personal Growth ! :D :D :D ** You don’t want to enter into details HERE. Dante Alighieri himself would be happy to see I am roughly «Nel mezzo del cammin di nostra vita…» ! 17
HOW IS CODING RELATED WITH ONE OF THE WORLD’ RENOWN LITERATURE MASTERPIECES
A short summary The Divine Comedy (Italian: Divina Commedia [diˈviːna komˈmɛːdja]) is a long narrative poem by Dante Alighieri, begun c. 1308 and completed in 1320, a year before his death in 1321. It is widely considered the preeminent work in Italian literature, and is seen as one of the greatest works of world literature. The poem's imaginative vision of the afterlife is representative of the medieval world-view as it had developed in the Western Church by the 14th century. It helped establish the Tuscan language, in which it is written, as the standardized Italian language. It is divided into three parts: Inferno, Purgatorio, and Paradiso.
Was Dante Alighieri a CODER !? The Divine Comedy is composed of 14,233 lines that are divided into three canticas (Italian plural cantiche) – Inferno (Hell), Purgatorio (Purgatory), and Paradiso (Paradise) – each consisting of 33 cantos (Italian plural canti). An initial canto, serving as an introduction to the poem and generally considered to be part of the first cantica, brings the total number of cantos to 100. It is generally accepted, however, that the first two cantos serve as a unitary prologue to the entire epic, and that the opening two cantos of each cantica serve as prologues to each of the three canticas.
Not just an algorithm for salvation, but encryption too ! Dante’s Initiate life and his relationship with Wisdom and its followers probably started at the time when he wrote theVita Nuova (the New Life) and culminated during the time he composed the Divine Comedy. In the Inferno section (IX, 61) Dante explicitly says “O you possessed of sturdy intellects, observe the teaching which is hidden here beneath the veil of verses so obscure” and then he goes on to describe his spiritual journey starting with the descent into the centre of the Earth (alchemical Black phase) and the climbing of the mountain of Purgatory (White phase) to reach the stars and the vision of God (his higher self). As he enters Paradise (Red phase) he says: “I was within the heaven that receives more of His light; and I saw things that he who from that height descends, forgets or cannot tell”.
UHM, OK.. WHAT IS THAT ALL ABOUT ?
Divine gift of coding v.1.0 final public
…つづく
KEYS TO DECODE LIFE – An Algorithm for Salvation START GATES OF HELL PURGATORY’S PINNACLE ANGELICAL SPHERES SALVATION
1.1 CROSS HELL 1.2 MIND EACH SIN 1.3 ELABORATE 2.1 REPENT 2.2 CLIMB 2.3 REPENT & BEG 3.1 ASCEND 3.2 GLORIFY 3.3 DON’T STARE ! 1 2 3 KEYS TO DECODE LIFE – An Algorithm for Salvation
DANTE’S CODING, A WAY TO SALVATION AS READERS, WE STAND … GUIDED TO SALVATION DANTE ON HIS SIDE, REFERRED TO SCRIPTURES COULD HAVE HE MESSED THINGS UP, WHILE CODING IT ?
PITFALLS IN CODING THE DIVINE COMEDY We can rest assured that our Hero had few risks, vulnerabilities and potential errors to take care of … let’s try to actualize them. MIDDLE AGES MODERN WORLD Heresy and / or Blasphemy Style or Rhymes Errors Typos Syntax Error(s) Coding Error(s) Design Flaw(s) or hidden Vulnerability(ies)
CONSEQUENCES OUCH ! … if you think THIS could have been painful at the time… MIDDLE AGES Heresy and / or Blasphemy Style or Rhymes Errors Typos Uhm … Well … It’s all about angry, picky readers … He could have got some bad feedback but given the means of typewriting techniques… He would have survived… Readability and the capability to intepret could have led to miscomprehension and misguidance, impairing the reader on its path to salvation! Roman Church had been pretty rough on misbehaving christians over europe for two centuries… Dante risked excommunication in a time when inquisition was the norm…
PITFALLS IN CODING THE DIVINE COMEDY …consider how many times THIS can happen ! MODERN WORLD Syntax Error(s) Coding Error(s) Design Flaw(s) or hidden Vulnerability(ies) Syntax Errors in code may spread across functions jumping instructions An error in coding (design or writing) may break function points outputs impairing an entire application workflow We could find ourselves actively opening doors to attackers due to our coding or to known vulnerabilities!
HOW IS CODE SECURITY RELATING WITH ONE OF THE WORLD’ RENOWN LITERATURE MASTERPIECES
We Create Worlds
We Create Worlds … Ok ok sorry, got caught by nostalgia … what I meant to share is :
They Created Worlds We make a grand discussion on A.I. lately … Yet what were early applications of Artificial Intelligence, aimed at, in the nineties? … Gaming ! Of course … Now a … very brief «excursus» on Machine Learning techniques over the years… State Machine Finite State Machine Behavior Tree Planner Utility Based AI PROS & CONS !
…and it seems the game is still on… Some “Worlds” worked out pretty well in the past … The ULTIMA series consisted of 9 main games released from 1981 to 1999 and was an extremely influential Computer RPG series that is still remembered fondly today. https://youtu.be/0ru57c1HlV8
… in ever new ways … Some worked out very oddly … No Man’s Sky was one of the most expected procedural galaxy space exploration game of 2017. Resulted in a YEAR LONG developer’s drama @ HELLO GAMES. https://www.youtube.com/watch?v=qAJymAKatnk
… and now… tell me THIS doesn’t look like a videogame* ! * NOPE … it’s the ACTUAL Tesla Autopilot Dashboard
… and now… tell me THIS doesn’t look like a videogame* ! * NOPE … it’s the ACTUAL SpaceX Console Rendering
Quick Facts / Realiy Check What if my procedurally evolved gaming algorithm goes wrong ? Virtuality (http://bfy.tw/ECgM)
Quick Facts / Realiy Check Reality What if my procedurally evolved self-driving algorithm, goes wrong ?
OK NOW WE UNDERSTOOD WE CAN BUILD NICE VIDEOGAMES … SO WHAT?
… WELL … THERE’S MORE …
Divine gift of coding v.1.0 final public
Divine gift of coding v.1.0 final public
Divine gift of coding v.1.0 final public
Divine gift of coding v.1.0 final public
IN TIME, PERHAPS …
DEVELOPMENT, DELIVERY, SECURITY … IN THE (SUCH A) MODERN WORLD.
So well… it seems You, can Create Worlds Designing an algorithm is not only solving a mathemathical and/or statistical problem via «choices» made ahead of coding time. Not anymore at least. Today, excelling is to be adaptive, lean, agile, not only during the design and develop process but in code Release, Delivery and Integration phases too, staying agile and adaptive right until production.
So well… it seems You, can Create Worlds What once was front-end and back-end, is today’s full-stack. Once Waterfall Delivery is today’s Continuous Delivery and Continuous Integration. Once versioning, is nowaday’s Release Management. Everything tends to become fluid, continuous. Security Tests Security Tests
So well… it seems You, can Create Worlds Infrastructure becomes more and more a combination of Bare Metal + Code. Devices are virtual, Network is virtual and even application servers are. Truth is that Systems are becoming applications and Applications are becoming systems. Settling ,once and for all, the DEV versus OPS dispute!
THIS IS CODE THIS IS CODE THE FIGHT IS OVER! WE CAN BE FRIENDS NOW! MUST BE SECURE BY DESIGN MUST BE SECURE BY DESIGN
BUT THERE’S MORE THAN DEV AND OPS … THERE’S THE SEC* ! *nope, not talking Wall Street here… 
A recap on SDLC
A recap on SDLC
Dante’s Programming Pitfalls Dante Alighieri and the cases for Quality Assurance Functio nal Non Functio nal • Resilience • Reliability • Availability • Recovery • Syntax • Structure • IntrinsicQuality • Transparency • Modularit y Heresy and / or Blasphemy Style or Rhymes Errors Typos
US and the cases for Quality Assurance Functio nal Non Functio nal • Resilience • Reliability • Availability • Recovery • Syntax • Structure • IntrinsicQuality • Transparency • Modulari ty Modern Programming Pitfalls
OK, I SAW A TESLA CRASH, MISSILES EXPLODING … YOU GOT ME SCARED …WHAT CAN I DO TO PREVENT IT !?
EASY AS 1, 2, 3 … More trust to Wikipedia? … Tzk..Tzk…!
…not quite! Truth is … we, as humans … when we go wrong, we often do it for distraction and with a loud BOOM ! …assuming this… DESIGN… with an exploding missile in mind… …we all shall … PEER REVIEW DEVELOP… escaping inputs and distilling output as if a demon is chasing us… PEER REVIEW TEST … as if there’s no tomorrow at all… PEER REVIEW DEPLOY … ensuring production environment doesn’t nullify previous insomnias!
KEY TO SAFE DEVELOPMENT PRACTICES IDYLLIC SECURITY FIRST ! I SAY WHEN WE DEPLOY Not if I’m dissatisfied with testing ! Visualizing 3D VR attack patterns, firing at bugs and errors * WHY A CAT? Everyone loves kittens ! ** **Skeptical?->https://en.wikipedia.org/wiki/Cats_and_the_Internet
KEY TO SAFE DEVELOPMENT PRACTICES REAL INVOICE SECURITY FIRST! I’ll never make it in time !!!
WHAT IS THE TAKE-HOME ?
1 2 3 QUICK RECAP … Living a Sinless Life from its early stages… …means no hassle in the AFTERLIFE™… …translating into : you’ll be, the safer you can be!
QUICK RECAP … Living a Sinful Life from its early stages… …means «you know what» in AFTERLIFE™… …translating into : you’ve earned Paradise at a cost!* *IF…YouevenevermakeitoutofHellanPurgatoryINTACT!
One thing is for sure, living a careful and attentive SINLESS, LIFE, led, in Dante’s view, to have less chellenges in its wonderfully depicted EPIC AFTERLIFE™ JOURNEY. Being a ruthless sinner during LIFE on earth, meant a potentially INFINITE STRUGGLE in the AFTERLIFE with potentially NO REMEDIATION OR FORGIVENESS.
SO, TO ACTUALIZE … IF SECURITY IS APPLIED EARLIER, THERE’S SOME CATCH ! YEAH, HE’S the first S in Secure SDLC
SO, TO ACTUALIZE … IF SECURITY IS APPLIED EARLIER, THERE’S SOME CATCH ! YEAH, HE’S the first S in Secure SDLC DESIGN DEPLOY DEVELOP 3D SECURITY
IF ANYTHING … INVESTING IN KNOWLEDGE BASE ARCHIVES, IDE INTEGRATION FOR SAST AND INTEGRATING THE DAST PROCESS WITH THE INFRASTRUCTURE TESTING, IS THE ONLY WAY TO AVOID DEVELOPER’S HELL ! GETTING THERE LATE MEANS A (MEASURED) INCREMENT IN TESTING AND REMEDIATION OF ABOUT 30X COST. IF WE DON’T SWIM UPSTREAM IN THE SSDLC, WE CAN SAY GOODBYE TO DEVELOPER’S PARADISE !
Divine gift of coding v.1.0 final public
alert(«MANY THANKS !"); MANY THANKS !
THE END ?
NOT REALLY … WE TAKE IT FROM HERE, TO A Q&A SESSION AND… … LET’S KEEP REASONING ON THE AVAILABLE MEANS AND TECHNIQUES WE DO AND CAN ADOPT TO MAKE ALL THIS APPLICABLE IN REAL, EVERYDAY WORK & LIFE!

More Related Content

Divine gift of coding v.1.0 final public

  • 1. IS CODING… …A DIVINE GIFT ? On how Dante Alighieri De-Coded and Re-Coded scriptures itself, to help diffuse a sustainable path to salvation ! The process of imaginification. https://fossbytes.com/stackgan-ai-text-to-image-conversion/ https://arxiv.org/pdf/1612.03242v1.pdf
  • 2. A BRIEF INTRODUCTION ABOUT MYSELF: I’m THIS GUY here* -> YEAH… I REALLY DO ENJOY WORKING IN THE WOODS! https://it.linkedin.com/in/fabriziocilli www.linkedin.com/pulse/posts/fabriziocilli* I know… I look much better in the picture … 
  • 3. A BRIEF INTRODUCTION ABOUT MYSELF: ! * Special Thanks: Mom and Dad. A not foreseeable amount of years of Happiness , Fulfillment and Personal Growth ! :D :D :D ** You don’t want to enter into details HERE. Dante Alighieri himself would be happy to see I am roughly «Nel mezzo del cammin di nostra vita…» ! 17
  • 4. HOW IS CODING RELATED WITH ONE OF THE WORLD’ RENOWN LITERATURE MASTERPIECES
  • 5. A short summary The Divine Comedy (Italian: Divina Commedia [diˈviːna komˈmɛːdja]) is a long narrative poem by Dante Alighieri, begun c. 1308 and completed in 1320, a year before his death in 1321. It is widely considered the preeminent work in Italian literature, and is seen as one of the greatest works of world literature. The poem's imaginative vision of the afterlife is representative of the medieval world-view as it had developed in the Western Church by the 14th century. It helped establish the Tuscan language, in which it is written, as the standardized Italian language. It is divided into three parts: Inferno, Purgatorio, and Paradiso.
  • 6. Was Dante Alighieri a CODER !? The Divine Comedy is composed of 14,233 lines that are divided into three canticas (Italian plural cantiche) – Inferno (Hell), Purgatorio (Purgatory), and Paradiso (Paradise) – each consisting of 33 cantos (Italian plural canti). An initial canto, serving as an introduction to the poem and generally considered to be part of the first cantica, brings the total number of cantos to 100. It is generally accepted, however, that the first two cantos serve as a unitary prologue to the entire epic, and that the opening two cantos of each cantica serve as prologues to each of the three canticas.
  • 7. Not just an algorithm for salvation, but encryption too ! Dante’s Initiate life and his relationship with Wisdom and its followers probably started at the time when he wrote theVita Nuova (the New Life) and culminated during the time he composed the Divine Comedy. In the Inferno section (IX, 61) Dante explicitly says “O you possessed of sturdy intellects, observe the teaching which is hidden here beneath the veil of verses so obscure” and then he goes on to describe his spiritual journey starting with the descent into the centre of the Earth (alchemical Black phase) and the climbing of the mountain of Purgatory (White phase) to reach the stars and the vision of God (his higher self). As he enters Paradise (Red phase) he says: “I was within the heaven that receives more of His light; and I saw things that he who from that height descends, forgets or cannot tell”.
  • 8. UHM, OK.. WHAT IS THAT ALL ABOUT ?
  • 11. KEYS TO DECODE LIFE – An Algorithm for Salvation START GATES OF HELL PURGATORY’S PINNACLE ANGELICAL SPHERES SALVATION
  • 12. 1.1 CROSS HELL 1.2 MIND EACH SIN 1.3 ELABORATE 2.1 REPENT 2.2 CLIMB 2.3 REPENT & BEG 3.1 ASCEND 3.2 GLORIFY 3.3 DON’T STARE ! 1 2 3 KEYS TO DECODE LIFE – An Algorithm for Salvation
  • 13. DANTE’S CODING, A WAY TO SALVATION AS READERS, WE STAND … GUIDED TO SALVATION DANTE ON HIS SIDE, REFERRED TO SCRIPTURES COULD HAVE HE MESSED THINGS UP, WHILE CODING IT ?
  • 14. PITFALLS IN CODING THE DIVINE COMEDY We can rest assured that our Hero had few risks, vulnerabilities and potential errors to take care of … let’s try to actualize them. MIDDLE AGES MODERN WORLD Heresy and / or Blasphemy Style or Rhymes Errors Typos Syntax Error(s) Coding Error(s) Design Flaw(s) or hidden Vulnerability(ies)
  • 15. CONSEQUENCES OUCH ! … if you think THIS could have been painful at the time… MIDDLE AGES Heresy and / or Blasphemy Style or Rhymes Errors Typos Uhm … Well … It’s all about angry, picky readers … He could have got some bad feedback but given the means of typewriting techniques… He would have survived… Readability and the capability to intepret could have led to miscomprehension and misguidance, impairing the reader on its path to salvation! Roman Church had been pretty rough on misbehaving christians over europe for two centuries… Dante risked excommunication in a time when inquisition was the norm…
  • 16. PITFALLS IN CODING THE DIVINE COMEDY …consider how many times THIS can happen ! MODERN WORLD Syntax Error(s) Coding Error(s) Design Flaw(s) or hidden Vulnerability(ies) Syntax Errors in code may spread across functions jumping instructions An error in coding (design or writing) may break function points outputs impairing an entire application workflow We could find ourselves actively opening doors to attackers due to our coding or to known vulnerabilities!
  • 17. HOW IS CODE SECURITY RELATING WITH ONE OF THE WORLD’ RENOWN LITERATURE MASTERPIECES
  • 19. We Create Worlds … Ok ok sorry, got caught by nostalgia … what I meant to share is :
  • 20. They Created Worlds We make a grand discussion on A.I. lately … Yet what were early applications of Artificial Intelligence, aimed at, in the nineties? … Gaming ! Of course … Now a … very brief «excursus» on Machine Learning techniques over the years… State Machine Finite State Machine Behavior Tree Planner Utility Based AI PROS & CONS !
  • 21. …and it seems the game is still on… Some “Worlds” worked out pretty well in the past … The ULTIMA series consisted of 9 main games released from 1981 to 1999 and was an extremely influential Computer RPG series that is still remembered fondly today. https://youtu.be/0ru57c1HlV8
  • 22. … in ever new ways … Some worked out very oddly … No Man’s Sky was one of the most expected procedural galaxy space exploration game of 2017. Resulted in a YEAR LONG developer’s drama @ HELLO GAMES. https://www.youtube.com/watch?v=qAJymAKatnk
  • 23. … and now… tell me THIS doesn’t look like a videogame* ! * NOPE … it’s the ACTUAL Tesla Autopilot Dashboard
  • 24. … and now… tell me THIS doesn’t look like a videogame* ! * NOPE … it’s the ACTUAL SpaceX Console Rendering
  • 25. Quick Facts / Realiy Check What if my procedurally evolved gaming algorithm goes wrong ? Virtuality (http://bfy.tw/ECgM)
  • 26. Quick Facts / Realiy Check Reality What if my procedurally evolved self-driving algorithm, goes wrong ?
  • 27. OK NOW WE UNDERSTOOD WE CAN BUILD NICE VIDEOGAMES … SO WHAT?
  • 28. … WELL … THERE’S MORE …
  • 34. DEVELOPMENT, DELIVERY, SECURITY … IN THE (SUCH A) MODERN WORLD.
  • 35. So well… it seems You, can Create Worlds Designing an algorithm is not only solving a mathemathical and/or statistical problem via «choices» made ahead of coding time. Not anymore at least. Today, excelling is to be adaptive, lean, agile, not only during the design and develop process but in code Release, Delivery and Integration phases too, staying agile and adaptive right until production.
  • 36. So well… it seems You, can Create Worlds What once was front-end and back-end, is today’s full-stack. Once Waterfall Delivery is today’s Continuous Delivery and Continuous Integration. Once versioning, is nowaday’s Release Management. Everything tends to become fluid, continuous. Security Tests Security Tests
  • 37. So well… it seems You, can Create Worlds Infrastructure becomes more and more a combination of Bare Metal + Code. Devices are virtual, Network is virtual and even application servers are. Truth is that Systems are becoming applications and Applications are becoming systems. Settling ,once and for all, the DEV versus OPS dispute!
  • 38. THIS IS CODE THIS IS CODE THE FIGHT IS OVER! WE CAN BE FRIENDS NOW! MUST BE SECURE BY DESIGN MUST BE SECURE BY DESIGN
  • 39. BUT THERE’S MORE THAN DEV AND OPS … THERE’S THE SEC* ! *nope, not talking Wall Street here… 
  • 40. A recap on SDLC
  • 41. A recap on SDLC
  • 42. Dante’s Programming Pitfalls Dante Alighieri and the cases for Quality Assurance Functio nal Non Functio nal • Resilience • Reliability • Availability • Recovery • Syntax • Structure • IntrinsicQuality • Transparency • Modularit y Heresy and / or Blasphemy Style or Rhymes Errors Typos
  • 43. US and the cases for Quality Assurance Functio nal Non Functio nal • Resilience • Reliability • Availability • Recovery • Syntax • Structure • IntrinsicQuality • Transparency • Modulari ty Modern Programming Pitfalls
  • 44. OK, I SAW A TESLA CRASH, MISSILES EXPLODING … YOU GOT ME SCARED …WHAT CAN I DO TO PREVENT IT !?
  • 45. EASY AS 1, 2, 3 … More trust to Wikipedia? … Tzk..Tzk…!
  • 46. …not quite! Truth is … we, as humans … when we go wrong, we often do it for distraction and with a loud BOOM ! …assuming this… DESIGN… with an exploding missile in mind… …we all shall … PEER REVIEW DEVELOP… escaping inputs and distilling output as if a demon is chasing us… PEER REVIEW TEST … as if there’s no tomorrow at all… PEER REVIEW DEPLOY … ensuring production environment doesn’t nullify previous insomnias!
  • 47. KEY TO SAFE DEVELOPMENT PRACTICES IDYLLIC SECURITY FIRST ! I SAY WHEN WE DEPLOY Not if I’m dissatisfied with testing ! Visualizing 3D VR attack patterns, firing at bugs and errors * WHY A CAT? Everyone loves kittens ! ** **Skeptical?->https://en.wikipedia.org/wiki/Cats_and_the_Internet
  • 48. KEY TO SAFE DEVELOPMENT PRACTICES REAL INVOICE SECURITY FIRST! I’ll never make it in time !!!
  • 49. WHAT IS THE TAKE-HOME ?
  • 50. 1 2 3 QUICK RECAP … Living a Sinless Life from its early stages… …means no hassle in the AFTERLIFE™… …translating into : you’ll be, the safer you can be!
  • 51. QUICK RECAP … Living a Sinful Life from its early stages… …means «you know what» in AFTERLIFE™… …translating into : you’ve earned Paradise at a cost!* *IF…YouevenevermakeitoutofHellanPurgatoryINTACT!
  • 52. One thing is for sure, living a careful and attentive SINLESS, LIFE, led, in Dante’s view, to have less chellenges in its wonderfully depicted EPIC AFTERLIFE™ JOURNEY. Being a ruthless sinner during LIFE on earth, meant a potentially INFINITE STRUGGLE in the AFTERLIFE with potentially NO REMEDIATION OR FORGIVENESS.
  • 53. SO, TO ACTUALIZE … IF SECURITY IS APPLIED EARLIER, THERE’S SOME CATCH ! YEAH, HE’S the first S in Secure SDLC
  • 54. SO, TO ACTUALIZE … IF SECURITY IS APPLIED EARLIER, THERE’S SOME CATCH ! YEAH, HE’S the first S in Secure SDLC DESIGN DEPLOY DEVELOP 3D SECURITY
  • 55. IF ANYTHING … INVESTING IN KNOWLEDGE BASE ARCHIVES, IDE INTEGRATION FOR SAST AND INTEGRATING THE DAST PROCESS WITH THE INFRASTRUCTURE TESTING, IS THE ONLY WAY TO AVOID DEVELOPER’S HELL ! GETTING THERE LATE MEANS A (MEASURED) INCREMENT IN TESTING AND REMEDIATION OF ABOUT 30X COST. IF WE DON’T SWIM UPSTREAM IN THE SSDLC, WE CAN SAY GOODBYE TO DEVELOPER’S PARADISE !
  • 59. NOT REALLY … WE TAKE IT FROM HERE, TO A Q&A SESSION AND… … LET’S KEEP REASONING ON THE AVAILABLE MEANS AND TECHNIQUES WE DO AND CAN ADOPT TO MAKE ALL THIS APPLICABLE IN REAL, EVERYDAY WORK & LIFE!

Editor's Notes

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