The choice is a construct for choosing between a number of alternative algorithms. There are two forms of choice.
(315,060) (000,050)choice (000,030)(1,0)030100conditional-choice (1,0)030 (005,020)(20,20)[rt] (025,020)(20,20)[lb] (025,010)(1,0)005100numerical-choice (1,0)005 (135,020)(20,20)[rb] (155,020)(20,20)[lt]