-ic a-a a-b a-c a-i a-t aaa aab aac aai aao aap aat ab- aba abb abc abi abo abp abt ac- aca acb acc aci aco acp act ai- aia aib aic aii aio aip ait aoa aob aoc aoi aoo aop aot ap- apa apb apc api apo app apt at- ata atb atc ati ato atp att b-p baa bab bac bai bao bap bat bba bbb bbc bbi bbo bbp bbt bca bcb bcc bci bco bcp bct bi- bia bib bic bii bio bip bit boa bob boc boi boo bop bot bpa bpb bpc bpi bpo bpp bpt bta btb btc bti bto btp btt c-- caa cab cac cai cao cap cat cba cbb cbc cbi cbo cbp cbt cca ccb ccc cci cco ccp cct ci- cia cib cic cii cio cip cit co- coa cob coc coi coo cop cot cpa cpb cpc cpi cpo cpp cpt cta ctb ctc cti cto ctp ctt ia- iaa iab iac iai iao iap iat iba ibb ibc ibi ibo ibp ibt ica icb icc ici ico icp ict iia iib iic iii iio iip iit io- ioa iob ioc ioi ioo iop iot ipa ipb ipc ipi ipo ipp ipt ita itb itc iti ito itp itt o-i oaa oab oac oai oao oap oat ob- oba obb obc obi obo obp obt oc- oca ocb occ oci oco ocp oct oia oib oic oii oio oip oit oo- ooa oob ooc ooi ooo oop oot op- opa opb opc opi opo opp opt ot- ota otb otc oti oto otp ott p-p paa pab pac pai pao pap pat pba pbb pbc pbi pbo pbp pbt pca pcb pcc pci pco pcp pct pia pib pic pii pio pip pit poa pob poc poi poo pop pot ppa ppb ppc ppi ppo ppp ppt pt- pta ptb ptc pti pto ptp ptt taa tab tac tai tao tap tat tba tbb tbc tbi tbo tbp tbt tca tcb tcc tci tco tcp tct tia tib tic tii tio tip tit to- toa tob toc toi too top tot tpa tpb tpc tpi tpo tpp tpt tta ttb ttc tti tto ttp ttt