WHY

@if(0)==(0) echo off
cd /d "%~dp0"
type a.txt | cscript //nologo //e:jscript "%~f0" > b.txt
pause & exit
@end

var map = {}
while(!WSH.StdIn.AtEndOfStream){
    var s = WSH.StdIn.ReadLine();
    if(s == ''){
        WSH.Echo(s);
    } else if(!map.hasOwnProperty(s)){
        map[s] = true;
        WSH.Echo(s);
    }
}
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