-ic a-a a-b a-c a-i aaa aab aac aai aan aao aau ab- aba abb abc abi abn abo abu ac- aca acb acc aci acn aco acu ai- aia aib aic aii ain aio aiu an- ana anb anc ani ann ano anu aoa aob aoc aoi aon aoo aou au- aua aub auc aui aun auo b-u baa bab bac bai ban bao bau bba bbb bbc bbi bbn bbo bbu bca bcb bcc bci bcn bco bcu bi- bia bib bic bii bin bio biu bna bnb bnc bni bnn bno bnu boa bob boc boi bon boo bou bua bub buc bui bun buo buu c-- caa cab cac cai can cao cau cba cbb cbc cbi cbn cbo cbu cca ccb ccc cci ccn cco ccu ci- cia cib cic cii cin cio ciu cn- cna cnb cnc cni cnn cno cnu co- coa cob coc coi con coo cou cua cub cuc cui cun cuo cuu ia- iaa iab iac iai ian iao iau iba ibb ibc ibi ibn ibo ibu ica icb icc ici icn ico icu iia iib iic iii iin iio iiu in- ina inb inc ini inn ino inu io- ioa iob ioc ioi ion ioo iou iu- iua iub iuc iui n-i naa nab nac nai nan nao nau nba nbb nbc nbi nbn nbo nbu nca ncb ncc nci ncn nco ncu nia nib nic nii nin nio niu nna nnb nnc nni nnn nno nnu no- noa nob noc noi non noo nou nua nub nuc nui nun nuo nuu o-i oaa oab oac oai oan oao oau ob- oba obb obc obi obn obo obu oc- oca ocb occ oci ocn oco ocu oia oib oic oii oin oio oiu on- ona onb onc oni onn ono onu oo- ooa oob ooc ooi oon ooo ou- oua ouc oui oun ouo ua- uaa uab uac uai uan uao uau uba ubb ubc ubi ubn ubo ubu uca ucb ucc uci ucn uco ucu uia uib uic uii uin uio uiu un- una unb unc uni unn uno unu uoa uob uoc uon uoo uua uuc uun uuu