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@var = something1 grep {
         something2 &&
...
       } map {
         something4
       } keys %something5;

@var = something1
       grep { something2 && something3 }
       map  { something4 }
       keys %something5;

@var = something1
       grep { something2 }
       grep { something3 }
       map  { something4 }
       keys %something5;

if( $var1 == 1 ) {
    if( $var2 == 2 ) {
         doSomething();
    }
}

if( $var1 == 1 && $var2 == 2 ) {
     doSomething();
}