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    @oddsquares = map { $_**2 }, sort grep { $_ % 2 }, @nums;

    # more clearly written as...

    @oddsquares = map { $_**2 } <== sort <== grep { $_ % 2 } <== @nums
+;

    @oddsquares =
            (@nums ==> grep { $_ % 2 } ==> sort ==> map { $_**2 });