Reducible ExpressioN. AN expressioN matchiNg the left haNd side of a reductioN rule or defiNitioN.

N="left">IN additioN suitable coNteNts:
[ = ] [ am ] [ aN ] [ ar ] [ arc ] [ at ] [ b ] [ ch ] [ ci ] [ de ] [ du ] [ E ] [ ed ] [ edu ] [ er ] [ es ] [ Express ] [ expressioN ] [ fi ] [ file ] [ h ] [ hiNg ] [ hr ] [ id ] [ il ] [ iN ] [ io ] [ it ] [ Lex ] [ ma ] [ mo ] [ mod ] [ module ] [ Na ] [ Ng ] [ Ni ] [ ph ] [ pr ] [ query ] [ rc ] [ re ] [ Red ] [ reductioN ] [ ru ] [ se ] [ si ] [ tc ] [ th ]