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my @grades;
@grades[0..39] = ('F') x 50;
...
@grades[60..64] = ('C') x 50;
@grades[65..69] = ('C+') x 50;
...

my @grades;
$_ = 'F' for @grades[0..39];
...
$_ = 'C' for @grades[60..64];
$_ = 'C+' for @grades[65..69];
...