-ic a-a a-b a-c a-i aaa aab aac aai aan aao aar ab- aba abb abc abi abn abo abr ac- aca acb acc aci acn aco acr ai- aia aib aic aii ain aio air an- ana anb anc ani ann ano anr aoa aob aoc aoi aon aoo aor ar- ara arb arc ari arn aro arr baa bab bac bai ban bao bar bba bbb bbc bbi bbn bbo bbr bca bcb bcc bci bcn bco bcr bi- bia bib bic bii bin bio bir bna bnb bnc bni bnn bno bnr boa bob boc boi bon boo bor bra brb bri brn bro brr c-- caa cab cac cai can cao car cba cbb cbc cbi cbn cbo cbr cca ccb ccc cci ccn cco ccr ci- cia cib cic cii cin cio cir cn- cna cnb cnc cni cnn cno cnr co- coa cob coc coi con coo cor cra crb crc cri crn cro crr ia- iaa iab iac iai ian iao iar iba ibb ibc ibi ibn ibo ibr ica icb icc ici icn ico icr iia iib iic iii iin iio iir in- ina inb inc ini inn ino inr io- ioa iob ioc ioi ion ioo ior ir- ira irb irc iri irn iro irr n-i naa nab nac nai nan nao nar nba nbb nbc nbi nbn nbo nbr nca ncb ncc nci ncn nco ncr nia nib nic nii nin nio nir nna nnb nnc nni nnn nno no- noa nob noc noi non noo nor nra nrb nrc nri nrn nro nrr o-i oaa oab oac oai oan oao oar ob- oba obb obc obi obn obo obr oc- oca ocb occ oci ocn oco ocr oia oib oic oii oin oio oir on- ona onb onc oni onn ono onr oo- ooa oob ooc ooi oon ooo oor or- ora orb orc ori orn oro orr ra- raa rab rac rai ran rao rar rba rbb rbc rbi rbn rbo rbr rca rcb rcc rci rcn rco rcr ria rib ric rii rin rio rir rna rnb rnc rni rnn rno rnr roa rob roc roi ron roo ror rra rrb rrc rri rrn rrr