-ic a-a a-b a-c a-i aaa aab aac aad aaf aai aan aar ab- aba abb abc abd abf abi abn abr ac- aca acb acc acd acf aci acn acr ad- ada adb adc add adf adi adn adr af- afa afb afc afd aff afi afn afr ai- aia aib aic aid aif aii ain air an- ana anb anc and anf ani ann anr ar- ara arb arc ard arf ari arn arr baa bab bac bad baf bai ban bar bba bbb bbc bbd bbf bbi bbn bbr bca bcb bcc bcd bcf bci bcn bcr bda bdb bdc bdd bdf bdi bdr bfa bfb bfc bfd bff bfi bfn bfr bi- bia bib bic bid bif bii bin bir bna bnb bnc bnd bnf bni bnn bnr bra brb brd brf bri brn brr c-- caa cab cac cad caf cai can car cba cbb cbc cbd cbf cbi cbn cbr cca ccb ccc ccd ccf cci ccn ccr cda cdb cdc cdd cdf cdi cdn cdr cfa cfb cfc cfd cff cfi cfn cfr ci- cia cib cic cid cif cii cin cir cn- cna cnb cnc cnd cnf cni cnn cnr cra crb crc crd crf cri crn crr daa dab dac dad daf dai dan dar dba dbb dbc dbd dbf dbi dbn dbr dca dcb dcc dcd dcf dci dcn dcr dda ddb ddc ddd ddf ddi ddn ddr dfa dfb dfc dfd dff dfi dfn dfr di- dia dib dic did dif dii din dir dna dnb dnc dnd dnf dni dnn dnr dra drb drc drd dri drn drr faa fab fac fad faf fai fan far fba fbb fbc fbd fbf fbi fbn fbr fca fcb fcc fcd fcf fci fcn fcr fda fdb fdc fdd fdf fdi fdn fdr ffa ffc ffd fff ffi ffn ffr fia fib fic fid fif fii fin fir fna fnb fnc fnd fnf fni fnn fnr fra frb frc frd frf fri frn frr i-d i-f ia- iaa iab iac iad iaf iai ian iar iba ibb ibc ibd ibf ibi ibn ibr ica icb icc icd icf ici icn icr ida idb idc idd idf idi idn idr ifa ifb ifc ifd iff ifi ifn ifr iia iib iic iid iif iii iin iir in- ina inb inc ind inf ini inn inr ir- ira irb irc ird irf iri irn irr n-i naa nab nac nad naf nai nan nar nba nbb nbc nbd nbf nbi nbn nbr nca ncb ncc ncd ncf nci ncn ncr nda ndb ndc ndd ndf ndi ndn ndr nfa nfb nfc nfd nff nfi nfn nfr nia nib nic nid nif nii nin nir nna nnb nnc nnf nni nnn nra nrb nrc nrd nrf nri nrn nrr ra- raa rab rac rad raf rai ran rar rba rbb rbc rbd rbf rbi rbn rbr rca rcb rcc rcd rcf rci rcn rcr rda rdb rdc rdd rdf rdi rdn rdr rfa rfb rfc rfd rff rfi rfn rfr ria rib ric rid rif rii rin rir rna rnb rnc rnd rni rnn rnr rra rrb rrc rrd rrf rri rrn rrr