-ey a-a a-b a-c aaa aab aac aad aae aao aap aay ab- aba abb abc abd abe abo abp aby ac- aca acb acc acd ace aco acp acy ad- ada adb adc add ade ado adp ady aea aeb aec aed aee aeo aep aey aoa aob aoc aod aoe aoo aop ap- apa apb apc apd ape apo app apy ay- aya ayc ayd aye ayo ayp b-p baa bab bac bad bae bao bap bay bba bbb bbc bbd bbe bbo bbp bby bca bcb bcc bcd bce bco bcp bcy bda bdb bdc bdd bde bdo bdp bdy be- bea beb bec bed bee beo bep bey boa bob boc bod boe boo bop boy bpa bpb bpc bpd bpe bpo bpp bpy by- bya byc byd bye byo byp c-- caa cab cac cad cae cao cap cay cba cbb cbc cbd cbe cbo cbp cby cca ccb ccc ccd cce cco ccp cda cdb cdc cdd cde cdo cdp cdy ce- cea ceb cec ced cee ceo cep cey co- coa cob coc cod coe coo cop coy cpa cpb cpc cpd cpe cpo cpp cya cyb cyc cyd cye cyo cyp daa dab dac dad dae dao dap day dba dbb dbc dbd dbe dbo dbp dby dca dcb dcc dcd dce dco dcp dda ddb ddc ddd dde ddo ddp ddy de- dea deb dec ded dee deo dep dey doa dob doc dod doe doo dop doy dpa dpb dpc dpd dpe dpo dpp dy- dya dyb dyc dyd dye dyo dyp dyy eaa eab eac ead eae eao eap eba ebb ebc ebd ebe ebo ebp eby ec- eca ecb ecc ecd ece eco ed- eda edb edc edd ede edo edp edy eea eeb eec eed eee eeo eep eey eo- eoa eob eoc eod eoe eoo eop ep- epa epb epc epd epe epo epp eya eyc eyd eye eyo eyp oaa oab oac oad oae oao oap ob- oba obb obc obd obe obo obp oby oc- oca ocb occ ocd oco ocp oda odb odc odd ode odo odp oea oeb oec oed oee oeo oep oey oo- ooa oob ooc ood ooo oop op- opa opb opc opd ope opo opp opy oya oyd oye oyo p-p paa pab pac pad pae pao pap pay pba pbb pbc pbd pbe pbo pbp pby pca pcb pcc pcd pce pco pcp pda pdb pdc pdd pde pdo pdp pea peb pec ped pee peo pep pey poa pob poc pod poe poo pop poy ppa ppb ppc ppd ppe ppo ppp py- pya pyb pyc pyd pye pyo yaa yab yac yad yae yao yap yay ybc ybe ybp yby yca ycc ycd yce yco ycp ycy yda yde ydo ydy yea yeb yec yed yee yeo yep yey yob yoc yod yoe yoo yop yoy ypa ypd ypo yyb yyc yye yyy