Example:

Problem:

(D)(2) Example using simple CRF (a) Hasse diagram (b) Upper set, lower set, and ambiguous set IVal=0, lLai = 3, lAel = 2 ; 1 Ta 3 IVel=0, llpl = 2, lAbi = 3 ; 1 Tb 4 IUel = 1, lLel = 2, lAel = 2 ; 2 Te 4 !Val = 1, llel = 1, lagi = 3 ; 2 Ta 5 !Vol = 2, llel = 0, lAel = 3 ; 3 Tg 6