BEGIN
    FOR n := 1 TO 1000 DO BEGIN
        FOR i := -5 TO 15 DO BEGIN
            CASE i OF
                2: ;
                -4, -2, 0, 4, 6, 8, 10, 12: ;
                -3, -1, 1, 3, 5, 7, 9, 11:  CASE i OF
                                                -3, -1, 1, 9, 11: ;
                                                2, 3, 5, 7:       ;
                                            END
            END
        END
    END
END.
