-ic a-a a-b a-c a-i aaa aab aac aai aao aas aav ab- aba abb abc abi abo abs abv ac- aca acb acc aci aco acs acv ai- aia aib aic aii aio ais aiv aoa aob aoc aoi aoo aos aov as- asa asb asc asi aso ass asv av- ava avb avc avi avo avs baa bab bac bai bao bas bav bba bbb bbc bbi bbo bbs bca bcb bcc bci bco bcs bcv bi- bia bib bic bii bio bis biv boa bob boc boi boo bos bov bsa bsb bsc bsi bso bss bsv bva bvb bvc bvi bvo bvs bvv c-- caa cab cac cai cao cas cav cba cbb cbc cbi cbo cbs cbv cca ccb ccc cci cco ccs ccv ci- cia cib cic cii cio cis civ co- coa cob coc coi coo cos cov csa csb csc csi cso css csv cva cvb cvc cvi cvo cvs cvv i-v ia- iaa iab iac iai iao ias iav iba ibb ibc ibi ibo ibs ibv ica icb icc ici ico ics icv iia iib iic iii iio iis io- ioa iob ioc ioi ioo ios iov is- isa isb isc isi iso iss isv iva ivb ivc ivi ivo ivs ivv o-i oaa oab oac oai oao oas oav ob- oba obb obc obi obo obs obv oc- oca ocb occ oci oco ocs ocv oia oib oic oii oio ois oiv oo- ooa oob ooc ooi ooo oos oov os- osa osb osc osi oso oss osv ov- ova ovb ovc ovi ovo ovs ovv saa sab sac sai sao sas sav sba sbb sbc sbi sbo sbs sbv sca scb scc sci sco scs scv sia sib sic sii sio sis siv soa sob soc soi soo sos sov ss- ssa ssb ssc ssi sso sss ssv sva svb svc svi svo svs svv v-a vaa vab vac vai vao vas vav vba vbc vbi vbo vbs vbv vca vcc vci vco vcs vi- via vib vic vii vio vis viv voa vob voc voi voo vos vov vsa vsb vsc vsi vso vss vsv vva vvb vvc vvi vvo vvs vvv