-ic a-a a-b a-c a-i aaa aab aac aai aao aav ab- aba abb abc abi abo abv ac- aca acb acc aci aco acv ai- aia aib aic aii aio aiv aoa aob aoc aoi aoo aov av- ava avb avc avi avo baa bab bac bai bao bav bba bbb bbc bbi bbo bca bcb bcc bci bco bcv bi- bia bib bic bii bio biv boa bob boc boi boo bov bva bvb bvc bvi bvo bvv c-- caa cab cac cai cao cav cba cbb cbc cbi cbo cbv cca ccb ccc cci cco ccv ci- cia cib cic cii cio civ co- coa cob coc coi coo cov cva cvb cvc cvi cvo cvv i-v ia- iaa iab iac iai iao iav iba ibb ibc ibi ibo ibv ica icb icc ici ico icv iia iib iic iii iio io- ioa iob ioc ioi ioo iov iva ivb ivc ivi ivo ivv o-i oaa oab oac oai oao oav ob- oba obb obc obi obo obv oc- oca ocb occ oci oco ocv oia oib oic oii oio oiv oo- ooa oob ooc ooi ooo oov ov- ova ovb ovc ovi ovo ovv v-a vaa vab vac vai vao vav vba vbc vbi vbo vbv vca vcc vci vco vi- via vib vic vii vio viv voa vob voc voi voo vov vva vvb vvc vvi vvo vvv