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my @myMainArray = 
    map { [ $myArray[$_] .. $myArray[$_+4] ] } 
    grep { !($_ % 5) } 0 .. $#myArray;

my @myMainArray = 
    map  { 
...
        : [ $myArray[$_] .. $myArray[-1] ] 
    } 
    grep { !($_ % 5) } 0 .. $#myArray;