-ic a-a a-b a-c a-i aaa aab aac aad aai aar ab- aba abb abc abd abi abr ac- aca acb acc acd aci acr ad- ada adb adc add adi adr ai- aia aib aic aid aii air ar- ara arb arc ard ari arr baa bab bac bad bai bar bba bbb bbc bbd bbi bbr bca bcb bcc bcd bci bcr bda bdb bdc bdd bdi bdr bi- bia bib bic bid bii bir bra brb brd bri brr c-- caa cab cac cad cai car cba cbb cbc cbd cbi cbr cca ccb ccc ccd cci ccr cda cdb cdc cdd cdi cdr ci- cia cib cic cid cii cir cra crb crc crd cri crr daa dab dac dad dai dar dba dbb dbc dbd dbi dbr dca dcb dcc dcd dci dcr dda ddb ddc ddd ddi ddr di- dia dib dic did dii dir dra drb drc drd dri drr i-d ia- iaa iab iac iad iai iar iba ibb ibc ibd ibi ibr ica icb icc icd ici icr ida idb idc idd idi idr iia iib iic iid iii iir ir- ira irb irc ird iri irr ra- raa rab rac rad rai rar rba rbb rbc rbd rbi rbr rca rcb rcc rcd rci rcr rda rdb rdc rdd rdi rdr ria rib ric rid rii rir rra rrb rrc rrd rri rrr