TETRAHEDRAL

aa ad ae ah al ar at de ed eh el er et ha he la re ta

aah aal aha ala ale alt are art ate att dah dal dee del ear eat edh eel eld era ere err eta eth had hae hat her het lad lar lat lea led lee let rad rah rat red ree ret tad tae tar tat tea ted tee tel tet the

ahed alae alar alee area dahl dale dare dart data date deal dear deer deet dele delt dere dhal drat dree earl eath haar hade haed haet hale halt hard hare harl hart hate head heal hear heat heed heel held herd here herl lade lard late lath lead lear leer leet lehr rale rare rate rath read real rear rede reed reel rete rhea tael tahr tala tale tare tart tate teal tear teat teed teel tela tele teth thae that thee trad tree tret