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  1. or download this
    chomp;
print /[^A-Z_,]/ ? 'bad' : 'good'
  2. or download this
    print /^(?:[A-Z_]+,?)+(?<!,)$/ ? 'good' : 'bad';
  3. or download this
    ($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,