[batch-file] Logical operators ("and", "or") in DOS batch

Only the OR part is tricky, but with a general boolean expression containing NOT OR AND the only nice solution is this:

REM if A == B OR C == C then yes

(call :strequ A B || call :strequ C C) && echo yes
exit /b

:strequ
if "%1" == "%2" exit /b 0
exit /b 1

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