(you can use Graphic editor; a term in CSDB Linear is normalized upon search)
aXKdop(structure ID 2705) has 2828 matches in CSDB
aXKdop(2-4)[aXKdop(2-8)]aXKdo(structure ID 37021) has 26 matches in CSDB
aXKdop(2-4)aXKdop(structure ID 114) has 1082 matches in CSDB
aXKdop(2-8)aXKdop(structure ID 6929) has 115 matches in CSDB
xXEtN(structure ID 36595) has 1478 matches in CSDB
xXEtN(1-P(structure ID 36597) has 1340 matches in CSDB