set lenw=2
set "word=a b c d e f g h i j k l m n o p q r s t u v w x y z "
for /l %%i in (1,1,%lenw%) do (
	for /l %%j in (1,1,%%i) do (
		for %%k in (%word%) do (
			set "_%%k=%_%%k%%%k"
                        ：：本想用变量不断迭代一个个值，后来发现所需变量太多，方法不对
)
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@echo off
set letters=a b c d e f g h i j k l m n o p q r s t u v w x y z
for %%i in (%letters%) do (
    for %%j in (%letters%) do (
        echo,%%i%%j
    )
)
pause
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@echo off&setlocal enabledelayedexpansion
call:perm "a b c xy z"
pause

:perm <"c1 c2 ..."> // code by plp
setlocal&set "s=%~1 "&if "!s: =!" == ""  (echo %~2)else for %%b in (%~1)do call:perm "!s:%%b =!" "%~2 %%b"
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