-ic a-a a-b a-c a-i aaa aab aac aah aai aao aap ab- aba abb abc abh abi abo abp ac- aca acb acc ach aci aco acp aha ahb ahc ahh ahi aho ahp ai- aia aib aic aih aii aio aip aoa aob aoc aoh aoi aoo aop ap- apa apb apc aph api apo app b-p baa bab bac bah bai bao bap bba bbb bbc bbh bbi bbo bbp bca bcb bcc bch bci bco bcp bha bhb bhc bhh bhi bho bhp bi- bia bib bic bih bii bio bip boa bob boc boh boi boo bop bpa bpb bpc bph bpi bpo bpp c-- caa cab cac cah cai cao cap cba cbb cbc cbh cbi cbo cbp cca ccb ccc cch cci cco ccp ch- cha chb chc chh chi cho chp ci- cia cib cic cih cii cio cip co- coa cob coc coh coi coo cop cpa cpb cpc cph cpi cpo cpp h-i haa hab hac hah hai hao hap hba hbb hbc hbh hbi hbo hbp hca hcb hcc hch hci hco hcp hha hhb hhc hhh hhi hho hhp hia hib hic hih hii hio hip hoa hob hoc hoh hoi hoo hop hpa hpb hpc hph hpi hpo hpp ia- iaa iab iac iah iai iao iap iba ibb ibc ibh ibi ibo ibp ica icb icc ich ici ico icp iha ihb ihc ihh ihi iho ihp iia iib iic iih iii iio iip io- ioa iob ioc ioh ioi ioo iop ipa ipb ipc ipi ipo ipp o-i oaa oab oac oah oai oao oap ob- oba obb obc obh obi obo obp oc- oca ocb occ och oci oco ocp oha ohc ohh ohi oho ohp oia oib oic oii oio oip oo- ooa oob ooc ooh ooi ooo oop op- opa opb opc oph opi opo opp p-p paa pab pac pah pai pao pap pba pbb pbc pbi pbo pbp pca pcb pcc pch pci pco pcp pha phb phc phi pho php pia pib pic pih pii pio pip poa pob poc poh poi poo pop ppa ppb ppc pph ppi ppo ppp