PTERIDINE

de ed en er et id in it ne pe pi re ti

dee den die din dip dit end ere ern ire nee net nip nit ped pee pen per pet pie pin pit red ree rei rep ret rid rin rip ted tee ten tie tin tip

deep deer deet dene deni dent dere diet dine dint dipt dire dirt dite dree drip edit eide erne inti ired irid need neep nerd nide nidi nite peed peen peer pein pend pent pere peri pert pied pier pine pint pirn pree rede reed rein rend rent rete ride rind ripe rite teed teen tend tern tide tied tier tine tipi tire tree trip