"M51 (missile)" . . "M51 SLBM" . "M5 strategic nuclear ballistic missile" . . . . "M51.1" . . . "new nuclear ballistic missile" . . "M51.2" . "12.0" . . "5.2E7" . "M51 missiles" . "2.3" . "M51 ballistic missile" . "M51 nuclear missiles" . . "M51 missile" . . "M51 (missile)" . "M51" . . . . . . .