-ic a-a a-b a-c a-i aaa aab aac aae aaf aai aan aao ab- aba abb abc abe abf abi abn abo ac- aca acb acc ace acf aci acn aco aea aeb aec aee aef aei aen aeo af- afa afb afc afe aff afi afn afo ai- aia aib aic aie aif aii ain aio an- ana anb anc ane anf ani ann ano aoa aob aoc aoe aof aoi aon aoo baa bab bac bae baf bai ban bao bba bbb bbc bbe bbf bbi bbn bbo bca bcb bcc bce bcf bci bcn bco be- bea beb bec bee bef bei ben beo bfa bfb bfc bfe bff bfi bfn bfo bi- bia bib bic bie bif bii bin bio bna bnb bnc bne bnf bni bnn bno boa bob boc boe bof boi bon boo c-- caa cab cac cae caf cai can cao cba cbb cbc cbe cbf cbi cbn cbo cca ccb ccc cce ccf cci ccn cco ce- cea ceb cec cee cef cei cen ceo cfa cfb cfc cfe cff cfi cfn cfo ci- cia cib cic cie cif cii cin cio cn- cna cnb cnc cne cnf cni cnn cno co- coa cob coc coe cof coi con coo eaa eab eac eae eaf eai ean eao eba ebb ebc ebe ebf ebi ebn ebo ec- eca ecb ecc ece ecf eci ecn eco eea eeb eec eee eef een eeo ef- efa efb efc efe eff efi efo eia eib eic eie eif eii ein eio en- ena enb enc ene enf eni enn eno eo- eoa eob eoc eoe eof eoi eon eoo faa fab fac fae faf fai fan fao fba fbb fbc fbe fbf fbi fbn fbo fca fcb fcc fce fcf fci fcn fco fea feb fec fee fef fei fen feo ffa ffc ffe fff ffi ffn ffo fia fib fic fie fif fii fin fna fnb fnc fne fnf fni fnn foa fob foc foe fof foi fon foo i-f ia- iaa iab iac iae iaf iai ian iao iba ibb ibc ibe ibf ibi ibn ibo ica icb icc ice icf ici icn ico ie- iea iec iee ief iei ien ifa ifb ifc ife iff ifi ifn ifo iia iib iic iie iif iii iin iio in- ina inb inc ine inf ini inn ino io- ioa iob ioc ioe iof ioi ion ioo n-i naa nab nac nae naf nai nan nao nba nbb nbc nbe nbf nbi nbn nbo nca ncb ncc nce ncf nci ncn nco ne- nea neb nec nee nef nei nen neo nfa nfb nfc nfe nff nfi nfn nfo nia nib nic nie nif nii nin nio nna nnb nnc nne nnf nni nnn nno no- noa nob noc noe nof noi non noo o-i oaa oab oac oae oaf oai oan oao ob- oba obb obc obe obf obi obn obo oc- oca ocb occ ocf oci ocn oco oea oeb oec oee oef oei oen oeo of- ofa ofb ofc ofe off ofi ofn ofo oia oib oic oie oif oii oin oio on- ona onb onc one onf oni onn ono oo- ooa oob ooc oof ooi oon ooo