Unification followed by unfolding. The left-hand Side of a rule iS unified with Some term, reSulting in a Set of variable bindingS. The term iS then replaced by the right-hand Side of the rule with valueS SubStituted for {bound variable}S.

Style="border-width:thin; border-color:#333333; border-Style:daShed; padding:5px;" align="left">In addition Suitable contentS:
[ = ] [ al ] [ am ] [ an ] [ ar ] [ arc ] [ at ] [ b ] [ bi ] [ bo ] [ bound variable ] [ bS ] [ by ] [ ca ] [ cat ] [ ch ] [ de ] [ ding ] [ du ] [ ed ] [ er ] [ eS ] [ et ] [ fi ] [ file ] [ fo ] [ for ] [ gh ] [ gS ] [ h ] [ hr ] [ ht ] [ id ] [ ie ] [ il ] [ in ] [ io ] [ iS ] [ it ] [ la ] [ ld ] [ Lex ] [ lt ] [ lu ] [ mo ] [ mod ] [ module ] [ na ] [ nf ] [ ng ] [ ni ] [ om ] [ ph ] [ pl ] [ query ] [ rc ] [ re ] [ ru ] [ Se ] [ Set ] [ Si ] [ So ] [ St ] [ Su ] [ T ] [ th ] [ unfold ] [ va ] [ value ] [ var ] [ variable ]