/== (?x ?y)  |  same as Prolog \==  | 
 = (?x ?y)  |  standard Prolog  | 
 =.. (?x ?y)  |  standard Prolog  | 
 == (?x ?y)  |  standard Prolog  | 
 @< (?x ?y)  |  same as Prolog except all variables sort as identical  | 
 @=< (?x ?y)  |  ditto  | 
 @> (?x ?y  |  ditto  | 
 @>= (?x ?y)  |  ditto  | 
 append (?x ?y ?z)  |  standard Prolog  | 
 arg (+index +term ?value)  |  standard Prolog  | 
 asserta (+exp)  |  standard Prolog  | 
 assertz (+exp)  |  standard Prolog  | 
 atomic (?x)  |  standard Prolog  | 
 bagof (?exp   (+goal . +ex-vars)   ?bag)  |  standard Prolog (unusual syntax)*  | 
 call (+exp)  |  standard Prolog  | 
 clause (+head ?tail)  |  standard Prolog  | 
 debug ()  |  cause debugging information to be saved for each call whether it is spied or not  | 
 debugging ()  |  display a list of all spied goals  | 
 defdetrel   (+name &rest +clauses)  |  define a relation and declare it to be deterministic  | 
 defgrammar   (+name &rest +rules)  |  define a grammar rule  | 
 defrel   (+name &rest +clauses)  |  define a relation  | 
 defrelmacro   (+name +args &rest +body)  |   define a logic macro  | 
 defrel-special-form-macro   (+name +args &rest +body)  |  like defrelmacro but can have &rest in +args . Use of this form will shadow all predicates named +name regardless of arity.  | 
 deterministic (+name)  |  declare the relation called ?name to be deterministic  | 
 erase (+ref)  |  delete the predicate with database reference ?ref from the database  | 
 fail ()  |  standard Prolog  | 
 findall   (?exp +goal ?result)  |  generate all solutions to ?goal and instantiate ?exp with the values. Return a list in ?result .  | 
 findallset   (?exp +goal ?result)  |  same as findall/3 but removes duplicates  | 
 functor   (?term ?functor ?arity)  |  standard Prolog  | 
 halt ()  |  exit Common Prolog  | 
 integer (?x)  |  standard Prolog  | 
 is (?result +exp)  |  standard Prolog  | 
 keysort (+in ?out)  |  standard Prolog except uses alist style cons pairs  | 
 leash (+event-spec)  |  cause the interpreter to pause and ask for input when one of the leashed events is traced. An event-spec is one of: (call exit redo fail), or a list of ports.  | 
 listing   (+name &optional +arity)  |  display a listing of the named predicate or listings for each arity if no arity is specified  | 
 member (?x ?y)  |  standard Prolog  | 
 nodebug ()  |  leave debug mode (cease saving debug info for non-spied goals)  | 
 nonvar (?x)  |  standard Prolog  | 
 nospy (+args)  |  remove +args from the list of spied goals. +args may be a predicate name or a list of predicate names. Unspy all goals if +args is nil  | 
 not (+x)  |  standard Prolog  | 
 notrace ()  |  turn off exhaustive tracing for debugged goals  | 
 once (+exp)  |  satisfy +exp as a goal once, then fail on retrying even if +exp has more solutions: this can be used to make a call deterministic so that the compiler can perform last call optimization  | 
 output-defrels   (+name ?defrels)  |  return a list of defrel expressions derived from the dynamic clauses associated with ?name  | 
 read-term (?term)  |  read in a term  | 
 recorda (+exp ?val ?ref)  |  standard Prolog  | 
 recorded (+term ?val ?ref)  |  standard Prolog  | 
 recordz (+exp ?val ?ref)  |  standard Prolog  | 
 repeat ()  |  standard Prolog  | 
 retract (+clause)  |  standard Prolog  | 
 setof (?exp   (+goal . +ex-vars)   ?bag)  |  standard Prolog (unusual syntax)*  | 
 sort (+in ?out)  |  standard Prolog  | 
 spy (+args)  |   spy +args . +args may be a predicate name or a list of predicate names. If arity is not mentioned for a predicate name, predicates of all aritys with that name are spied.  | 
 trace ()  |  turn on tracing for debugged goals, also turn on debugging for the next top level goal  | 
 translate-vars   (?intern ?extern)  |  translate back and forth between internal and external variable representations. Can be used to pretty up the writing of terms containing variables  | 
 true ()  |  standard Prolog  | 
 unleash (+event-spec)  |  Undo leashing for +event-spec. +event-spec may be a port or a list of ports. If +event-spec is nil, all ports are unleashed.  | 
 var (?x)  |  standard Prolog  |