-tree eeeee ekker ekmek ekrem emeer emere emerk emert emmer emmet emtee emtek erem- erere erte erter eteke etete etree etrek etter k-mer keere kekem kemer kemet kemme kerek kerem keret kerre ketek keter kette kreek kreke kreme krete meere meete meker meket memer merer meret merke merre merte mertk meter metr- metre mette mmmmm mrmet mt-te mt-tk mt-tm mt-tr mt-tt mtree reeme reere rekem rekke remee remer remet rere- reree reret retee retem reter rette rt-rk t-mek teeme teket tekke terek terem teret terme terre tert- teter tetr- tette treer treet treme trere trete trett ttttt