These words mean two types of tree: *U*A*Y**** ; *A*D*L*O**. What letters are missed?

I,K,L,P,T,U,S; C,M,I,Q,U,F
E,C,L,P,T,U,S; S,N,A,W,O,D
O,P,J,I,B,E,K; N,V,P,J,A,S
Y,K,G,N,E,V,A; W,P,E,K,I,H

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