a-a a-b a-c aaa aab aac aad aae aan aap ab- aba abb abc abd abe abn abp ac- aca acb acc acd ace acn acp ad- ada adb adc add ade adn adp aea aeb aec aed aee aen aep an- ana anb anc and ane ann anp ap- apa apb apc apd ape apn app b-p baa bab bac bad bae ban bap bba bbb bbc bbd bbe bbn bbp bca bcb bcc bcd bce bcn bcp bda bdb bdc bdd bde bdp be- bea beb bec bed bee ben bep bna bnb bnc bnd bne bnn bnp bpa bpb bpc bpd bpe bpn bpp c-- caa cab cac cad cae can cap cba cbb cbc cbd cbe cbn cbp cca ccb ccc ccd cce ccn ccp cda cdb cdc cdd cde cdn cdp ce- cea ceb cec ced cee cen cep cn- cna cnb cnc cnd cne cnn cnp cpa cpb cpc cpd cpe cpn cpp daa dab dac dad dae dan dap dba dbb dbc dbd dbe dbn dbp dca dcb dcc dcd dce dcn dcp dda ddb ddc ddd dde ddn ddp de- dea deb dec ded dee den dep dna dnb dnc dnd dne dnn dnp dpa dpb dpc dpd dpe dpn dpp eaa eab eac ead eae ean eap eba ebb ebc ebd ebe ebn ebp ec- eca ecb ecc ecd ece ecn ed- eda edb edc edd ede edn edp eea eeb eec eed eee een eep en- ena enb enc end ene enn enp ep- epa epb epc epd epe epn epp naa nab nac nad nae nan nap nba nbb nbc nbd nbe nbn nbp nca ncb ncc ncd nce ncn ncp nda ndb ndc ndd nde ndn ndp ne- nea neb nec ned nee nen nep nna nnb nnc nne nnn nnp npa npb npc npd npe npn npp p-p paa pab pac pad pae pan pap pba pbb pbc pbd pbe pbn pbp pca pcb pcc pcd pce pcn pcp pda pdb pdc pdd pde pdn pdp pea peb pec ped pee pen pep pn- pna pnb pnc pnd pne pnn pnp ppa ppb ppc ppd ppe ppn ppp