嵌套for循环中用于启用DelayedExpansion的语法

如果我简化了我的需求,我希望使用批处理文件得到这些字符串的最后两位数字。这不是确切的要求。但我让理解变得简单了。:)

 11-22-33
 11-22-44
 11-22-55
 11-22-66

预期结果是

33
44
55
66

这是我写的代码

 @echo off
    SetLocal EnableDelayedExpansion

    REM Fill strings to a array
    set DIR_COUNT=0
    for %%x in ("11-22-33" "11-22-44" "11-22-55" "11-22-66") do (    
        set /A DIR_COUNT+=1
        set  CONTENT_DIR_NAME=%%~x
        set "DIR_LIST[!DIR_COUNT!]=!CONTENT_DIR_NAME!"
    )

    REM This part is working when I hard code the index of array to 1. I placed this two lines for testing purpose of above code.
    for %%a in (%DIR_LIST[1]:-= %) do set mfgName=%%a
    echo %mfgName%

    REM this loop doesn't work because the syntax not correct. 
    for /L %%i in (1,1,%DIR_COUNT%) do (    
        for %%a in (%!DIR_LIST[%%i]!:-= %) do (
            set mfgName=%%a
            echo !mfgName!
        )
    )

作为我的理解句法 (%!DIR_LIST[%%i]!:-= %) 不正确。关于如何在delayedxpansion内执行delayedxpansion并更正此语法的任何想法