{HEAD ~ An information database} in communication with an information application comprises a plurality of marketplaces and {TAIL ~ a plurality} of listings respectively classified within the plurality of marketplaces 
comprises
{ HEAD ~ An information database } in communication with an information application comprises a plurality of marketplaces and { TAIL ~ a plurality } of listings respectively classified within the plurality of marketplaces
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH