-ic a-a a-b a-c a-i aaa aab aac aai aan aao aar aau ab- aba abb abc abi abn abo abr abu ac- aca acb acc aci acn aco acr acu ai- aia aib aic aii ain aio air aiu an- ana anb anc ani ann ano anr anu aoa aob aoc aoi aon aoo aor aou ar- ara arb arc ari arn aro arr aru au- aua aub auc aui aun auo aur b-u baa bab bac bai ban bao bar bau bba bbb bbc bbi bbn bbo bbr bbu bca bcb bcc bci bcn bco bcr bcu bi- bia bib bic bii bin bio bir biu bna bnb bnc bni bnn bno bnr bnu boa bob boc boi bon boo bor bou bra brb bri brn bro brr bru bua bub buc bui bun buo bur buu c-- caa cab cac cai can cao car cau cba cbb cbc cbi cbn cbo cbr cbu cca ccb ccc cci ccn cco ccr ccu ci- cia cib cic cii cin cio cir ciu cn- cna cnb cnc cni cnn cno cnr cnu co- coa cob coc coi con coo cor cou cra crb crc cri crn cro crr cru cua cub cuc cui cun cuo cur cuu ia- iaa iab iac iai ian iao iar iau iba ibb ibc ibi ibn ibo ibr ibu ica icb icc ici icn ico icr icu iia iib iic iii iin iio iir iiu in- ina inb inc ini inn ino inr inu io- ioa iob ioc ioi ion ioo ior iou ir- ira irb irc iri irn iro irr iru iu- iua iub iuc iui iur n-i naa nab nac nai nan nao nar nau nba nbb nbc nbi nbn nbo nbr nbu nca ncb ncc nci ncn nco ncr ncu nia nib nic nii nin nio nir niu nna nnb nnc nni nnn nno nnu no- noa nob noc noi non noo nor nou nra nrb nrc nri nrn nro nrr nru nua nub nuc nui nun nuo nur nuu o-i oaa oab oac oai oan oao oar oau ob- oba obb obc obi obn obo obr obu oc- oca ocb occ oci ocn oco ocr ocu oia oib oic oii oin oio oir oiu on- ona onb onc oni onn ono onr onu oo- ooa oob ooc ooi oon ooo oor or- ora orb orc ori orn oro orr oru ou- oua ouc oui oun ouo our ra- raa rab rac rai ran rao rar rau rba rbb rbc rbi rbn rbo rbr rbu rca rcb rcc rci rcn rco rcr rcu ria rib ric rii rin rio rir rna rnb rnc rni rnn rno rnr rnu roa rob roc roi ron roo ror rou rra rrb rrc rri rrn rrr rru rua rub ruc rui run ruo rur ruu ua- uaa uab uac uai uan uao uar uau uba ubb ubc ubi ubn ubo ubr ubu uca ucb ucc uci ucn uco ucr ucu uia uib uic uii uin uio uir uiu un- una unb unc uni unn uno unr unu uoa uob uoc uon uoo uor ur- ura urb urc uri urn uro urr uru uua uuc uun uur uuu