-er a-a a-c aaa aac aae aan aao aap aar ac- aca acc ace acn aco acp acr aea aec aee aen aeo aep aer an- ana anc ane ann ano anp anr aoa aoc aoe aon aoo aop aor ap- apa apc ape apn apo app apr ar- ara arc are arn aro arp arr c-- caa cac cae can cao cap car cca ccc cce ccn cco ccp ccr ce- cea cec cee cen ceo cep cer cn- cna cnc cne cnn cno cnp cnr co- coa coc coe con coo cop cor cpa cpc cpe cpn cpo cpp cpr cra crc cre crn cro crp crr eaa eac eae ean eao eap ear ec- eca ecc ece ecn eco ecr eea eec eee een eeo eep eer en- ena enc ene enn eno enp enr eo- eoa eoc eoe eon eoo eop eor ep- epa epc epe epn epo epp epr era erc ere ern ero erp err naa nac nae nan nao nap nar nca ncc nce ncn nco ncp ncr ne- nea nec nee nen neo nep ner nna nnc nne nnn nno nnp no- noa noc noe non noo nop nor npa npc npe npn npo npp npr nra nrc nre nrn nro nrp nrr oaa oac oae oan oao oap oar oc- oca occ ocn oco ocp ocr oea oec oee oen oeo oep oer on- ona onc one onn ono onp onr oo- ooa ooc oon ooo oop oor op- opa opc ope opn opo opp opr or- ora orc ore orn oro orp orr p-p paa pac pae pan pao pap par pca pcc pce pcn pco pcp pcr pea pec pee pen peo pep per pn- pna pnc pne pnn pno pnp pnr poa poc poe pon poo pop por ppa ppc ppe ppn ppo ppp ppr pra prc pre prn pro prp prr ra- raa rac rae ran rao rap rar rca rcc rce rcn rco rcp rcr re- rea rec ree ren reo rep rer rna rnc rnn rno rnp rnr roa roc roe ron roo rop ror rpa rpc rpe rpn rpo rpp rpr rra rrc rrn rrp rrr