Semaphore

(6, 7:30) A and 1
(6, 9) B and 2
(6, 10:30) C and 3
(6, 12) D and 4
(6, 1:30) E and 5
(6, 3) F and 6
(6, 4:30) G and 7
(7:30, 9) H and 8
(7:30, 12) I and 9
(12, 3) J
(7:30, 12) K and 0
(7:30, 1:30) L
(7:30, 3) M
(7:30, 4:30) N
(9, 10:30) O
(9, 12) P
(9, 1:30) Q
(9, 3) R
(9, 4:30) S
(10:30, 12) T
(10:30, 1:30) U
(12, 4:30) V
(1:30, 3) W
(1:30, 4:30) X
(10:30, 3) Y
(3, 4:30) Z