CHECKERBOARD

ab ad ae ah ar ba be bo de do ed eh er ha he ho ka od oe oh or re

abo ace ado arb arc are ark bad bah bar bed bee boa bod bra bro brr cab cad car cee cob cod cor dab dah dak deb dee doc doe dor ear edh eek eke era ere err had hae hao her hob hod hoe kab kae kea koa kob kor oak oar oba obe oca oda ode oka oke ora orb orc ore rad rah reb rec red ree rho rob roc rod roe

abed aced ache acre aero ahed akee arch arco bach back bade bake bard bare bark bead beak bear beck beer berk boar bock bode bora bore bork brad brae bred bree cade cake carb card care cark carr ceca cede cere cero chad chao char coca cock coda code coed coke cord core cork crab cred croc dace darb dare dark dear deck deco deer deke dere dhak dock doer dore dork dorr drab dree drek each eche echo eked hack hade haed hake hard hare hark head hear hebe heck heed herb herd here hero hoar hock hoed hoer hoke hora kbar kerb kora kore odah odea ohed okeh okra orad orca orra race rack rake rare read rear reck rede redo reed reek rhea road roar robe rock rode