digger

@echo off&setlocal enabledelayedexpansion
set /p b=请输入4位数(中间用空格分开):
for %%i in (!b!) do (
  for %%j in (!b!) do (
  set c=!b:%%j=!
  for %%k in (!c!) do set d=%%j%%k&if  "!d:%%i=!"=="!d!" echo %%i!d!
 )
)
pause
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