lib/backtracking/internal

->ABSTRACT_BACKTRACKING_GLOBALS
->ABSTRACT_BACKTRACKING_POOL
->ABSTRACT_BACKTRACKING_POOLABLE
->ABSTRACT_BACKTRACKING_POOL_OF_CUT_POINT
->BACKTRACKING_GLOBALS
->BACKTRACKING_POOL_OF_ALTERNATIVE
->BACKTRACKING_POOL_OF_ALTERNATIVE_LIST
->BACKTRACKING_POOL_OF_SEQUENCE
->BACKTRACKING_POOL_OF_SEQUENCE_LIST