(50, 51, 2, 'S')
(51, 52, 2, 'R')
(52, 53, 2, 'S')
(53, 54, 2, 'R')
(55, 54, 2, 'S')
(55, 56, 2, 'R')
(57, 56, 2, 'S')
(57, 58, 2, 'R')
(58, 59, 2, 'S')
