terse

@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%i in (15.txt) do (
    set "str=%%i,"
    for /f "delims=" %%j in (x3.txt) do (
        if defined str (
           for %%k in (%%j) do set "str=!str:%%k,=!"
           if "!str:~6!" == "" set "str="
        )
    )
    if defined str echo;%%i
)
pause
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