-ic a-a a-b a-c a-i aaa aab aac aai aan aao aay ab- aba abb abc abi abn abo aby ac- aca acb acc aci acn aco acy ai- aia aib aic aii ain aio aiy an- ana anb anc ani ann ano any aoa aob aoc aoi aon aoo ay- aya ayc ayi ayn ayo baa bab bac bai ban bao bay bba bbb bbc bbi bbn bbo bby bca bcb bcc bci bcn bco bcy bi- bia bib bic bii bin bio biy bna bnb bnc bni bnn bno boa bob boc boi bon boo boy by- bya byc byi byn byo c-- caa cab cac cai can cao cay cba cbb cbc cbi cbn cbo cby cca ccb ccc cci ccn cco ci- cia cib cic cii cin cio cn- cna cnb cnc cni cnn cno cny co- coa cob coc coi con coo coy cya cyb cyc cyn cyo ia- iaa iab iac iai ian iao iba ibb ibc ibi ibn ibo iby ica icb icc ici icn ico icy iia iib iic iii iin iio in- ina inb inc ini inn ino iny io- ioa iob ioc ioi ion ioo iya iyc iyo iyy n-i naa nab nac nai nan nao nay nba nbb nbc nbi nbn nbo nca ncb ncc nci ncn nco nia nib nic nii nin nio nna nnb nnc nni nnn nno no- noa nob noc noi non noo noy nya nyc nyn nyo nyy o-i oaa oab oac oai oan oao ob- oba obb obc obi obn obo oby oc- oca ocb occ oci ocn oco oia oib oic oii oin oio on- ona onb onc oni onn ono ony oo- ooa oob ooc ooi oon ooo oya oyi oyo yaa yab yac yai yan yao yay ybc ybi yby yca ycc yci yco ycy yii yin yio yna ynn yny yob yoc yoi yon yoo yoy yyb yyc yyy