tireless

@echo off
setlocal enabledelayedexpansion
for /f "delims=" %%a in (a.txt) do (
  set var2=.
  set var=%%a
  if "!var:鸡=!" neq "!var!" set var2=
  if "!var:7=!" neq "!var!" set var2=
  if not defined var2 (
    set var=!var:"=[[q]]!
    set var=!var:鸡=" "鸡!
    for %%a in ("!var:7=7" "!") do (
      if %%a=="鸡=7" (set var2=!var2!鸡=七) else set var2=!var2!%%~a
    )
    echo !var2:[[q]]="!
  ) else echo;!var!
)

pause
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