-ic a-a a-b a-c a-i aaa aab aac aai aan aao aap aar ab- aba abb abc abi abn abo abp abr ac- aca acb acc aci acn aco acp acr ai- aia aib aic aii ain aio aip air an- ana anb anc ani ann ano anp anr aoa aob aoc aoi aon aoo aop aor ap- apa apb apc api apn apo app apr ar- ara arb arc ari arn aro arp arr b-p baa bab bac bai ban bao bap bar bba bbb bbc bbi bbn bbo bbp bbr bca bcb bcc bci bcn bco bcp bcr bi- bia bib bic bii bin bio bip bir bna bnb bnc bni bnn bno bnp bnr boa bob boc boi bon boo bop bor bpa bpb bpc bpi bpn bpo bpp bpr bra brb bri brn bro brp brr c-- caa cab cac cai can cao cap car cba cbb cbc cbi cbn cbo cbp cbr cca ccb ccc cci ccn cco ccp ccr ci- cia cib cic cii cin cio cip cir cn- cna cnb cnc cni cnn cno cnp cnr co- coa cob coc coi con coo cop cor cpa cpb cpc cpi cpn cpo cpp cpr cra crb crc cri crn cro crp crr ia- iaa iab iac iai ian iao iap iar iba ibb ibc ibi ibn ibo ibp ibr ica icb icc ici icn ico icp icr iia iib iic iii iin iio iip iir in- ina inb inc ini inn ino inp inr io- ioa iob ioc ioi ion ioo iop ior ipa ipb ipc ipi ipn ipo ipp ipr ir- ira irb irc iri irn iro irp irr n-i naa nab nac nai nan nao nap nar nba nbb nbc nbi nbn nbo nbp nbr nca ncb ncc nci ncn nco ncp ncr nia nib nic nii nin nio nip nir nna nnb nnc nni nnn nno nnp no- noa nob noc noi non noo nop nor npa npb npc npi npn npo npp npr nra nrb nrc nri nrn nro nrp nrr o-i oaa oab oac oai oan oao oap oar ob- oba obb obc obi obn obo obp obr oc- oca ocb occ oci ocn oco ocp ocr oia oib oic oii oin oio oip oir on- ona onb onc oni onn ono onp onr oo- ooa oob ooc ooi oon ooo oop oor op- opa opb opc opi opn opo opp opr or- ora orb orc ori orn oro orp orr p-p paa pab pac pai pan pao pap par pba pbb pbc pbi pbn pbo pbp pbr pca pcb pcc pci pcn pco pcp pcr pia pib pic pii pin pio pip pir pn- pna pnb pnc pni pnn pno pnp pnr poa pob poc poi pon poo pop por ppa ppb ppc ppi ppn ppo ppp ppr pra prb prc pri prn pro prp prr ra- raa rab rac rai ran rao rap rar rba rbb rbc rbi rbn rbo rbp rbr rca rcb rcc rci rcn rco rcp rcr ria rib ric rii rin rio rip rir rna rnb rnc rni rnn rno rnp rnr roa rob roc roi ron roo rop ror rpa rpb rpc rpi rpn rpo rpp rpr rra rrb rrc rri rrn rrp rrr