Max number of tokens in FOR /f ?

I am using this token-based FOR subroutine
for /f "tokens=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26 delims=;" %a in (@00TMP.txt) DO GOSUB SUBEXTRACT3
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:SUBEXTRACT3
if "%a%" == "" RETURN
if %@LEN[%a%] LT 4 GOTO BBB
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if "%b%" == "" RETURN
if %@LEN[%b%] LT 4 GOTO CCC
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RETURN

It works well, but only if 00TMP.txt has no more than 26 lines. In this context, what variable names does FOR assign to tokens...

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