4.1.5.4 Built-in Operators
:- op( 1200, xfx, [ :-, --> ]).
:- op( 1200, fx, [ :-, ?- ]).
:- op( 1150, fx, [ mode, public, dynamic, volatile, discontiguous,
multifile, block, meta_predicate,
initialization ]).
:- op( 1100, xfy, [ ; ]).
:- op( 1050, xfy, [ -> ]).
:- op( 1000, xfy, [ ',' ]).
:- op( 900, fy, [ \+, spy, nospy ]).
:- op( 700, xfx, [ =, \=, is, =.., ==, \==, @<, @>, @=<, @>=,
=:=, =\=, <, >, =<, >= ]).
:- op( 550, xfy, [ : ]).
:- op( 500, yfx, [ +, -, \, /\, \/ ]).
:- op( 400, yfx, [ *, /, //, mod, rem, <<, >> ]).
:- op( 200, xfx, [ ** ]).
:- op( 200, xfy, [ ^ ]).
:- op( 200, fy, [ +, -, \ ]).
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