scomparison

scomparison:=
expressions | sas_expr
expressions | sas_expr < sas_exprlt
expressions | sas_expr <= sas_exprle
expressions | sas_expr == sas_expreq
expressions | sas_expr != sas_exprne
expressions | sas_expr >= sas_exprge
expressions | sas_expr > sas_exprgt