. . , , .. . , , . , , . , , , ( ), . , , , .
(for, while, repeat). . : , , . :
1. fail () , , .
2. Cut ! () .
repeat . :
repeat.
repeat:- repeat.
repeat , repeat . repeat , . , repeat, repeat. repeat , ( repeat). repeat repeat, , repeat . repeat , repeat, . . repeat . ( ) . , repeat , .
repeat :