 It helps us to extend the order-preserving (OP ) criterion , originally defined and carefully examined in 18%DIFDELCMD < ]%%% , into the design of the mappings.
<clarity>  It helps us to extend the order-preserving (OP ) criterion , originally defined and carefully examined in 18%DIFDELCMD < ]%%% , into the design of the mappings.
 It helps us to extend the order-preserving (OP ) criterion , originally defined and carefully examined in 18%DIFDELCMD < ]%%% OP criterion into the design of the mappings.