@echo off&setlocal enabledelayedexpansion
set a=0
set str=123456
for /l %%a in (%a%,1,6) do (
set /a b=!a!+1
set ax=!str:~%a%,1!
set bx=!str:~%b%,1!
echo a=!a! b=!b! ax=!ax! bx=!bx!
set /a a=!a!+1
)
pause
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