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Bold: more relevant
Light: older, less relevant, or not interested anymore.
Center: core skills
Periphery: less experienced, or skills formerly practiced
programming languages
operating systems
frameworks
STL
yacc
lex
Qt
MFC
MacApp
PowerPlant
UIMX
X-Motif
xlibs
xtoolkit
ODBC
QuickTime
flutter
un*x
macos
windows
linux
android
zOS
BSD
debian
ubuntu
redhat & Co
AIX
HP/UX
solaris
IRIX
RPG
javascript
fortran
object pascal
perl
python
VB
html
C++
SQL
php
dart
pascal
modula 2
bash
ksh
AionDS
xBase
applescript
hypercard
asm
C
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