-ic a-a a-b a-c a-i aaa aab aac aaf aai aan aar ab- aba abb abc abf abi abn abr ac- aca acb acc acf aci acn acr af- afa afb afc aff afi afn afr ai- aia aib aic aif aii ain air an- ana anb anc anf ani ann anr ar- ara arb arc arf ari arn arr baa bab bac baf bai ban bar bba bbb bbc bbf bbi bbn bbr bca bcb bcc bcf bci bcn bcr bfa bfb bfc bff bfi bfn bfr bi- bia bib bic bif bii bin bir bna bnb bnc bnf bni bnn bnr bra brb brf bri brn brr c-- caa cab cac caf cai can car cba cbb cbc cbf cbi cbn cbr cca ccb ccc ccf cci ccn ccr cfa cfb cfc cff cfi cfn cfr ci- cia cib cic cif cii cin cir cn- cna cnb cnc cnf cni cnn cnr cra crb crc crf cri crn crr faa fab fac faf fai fan far fba fbb fbc fbf fbi fbn fbr fca fcb fcc fcf fci fcn fcr ffa ffc fff ffi ffn ffr fia fib fic fif fii fin fir fna fnb fnc fnf fni fnn fnr fra frb frc frf fri frn frr i-f ia- iaa iab iac iaf iai ian iar iba ibb ibc ibf ibi ibn ibr ica icb icc icf ici icn icr ifa ifb ifc iff ifi ifn ifr iia iib iic iif iii iin iir in- ina inb inc inf ini inn inr ir- ira irb irc irf iri irn irr n-i naa nab nac naf nai nan nar nba nbb nbc nbf nbi nbn nbr nca ncb ncc ncf nci ncn ncr nfa nfb nfc nff nfi nfn nfr nia nib nic nif nii nin nir nna nnb nnc nnf nni nnn nra nrb nrc nrf nri nrn nrr ra- raa rab rac raf rai ran rar rba rbb rbc rbf rbi rbn rbr rca rcb rcc rcf rci rcn rcr rfa rfb rfc rff rfi rfn rfr ria rib ric rif rii rin rir rna rnb rnc rni rnn rnr rra rrb rrc rrf rri rrn rrr