H(performed(X),T)/\H(performed(Y),T)/\X!=Y
--->false.

H(start,0)
--->E(performed(a0),Ta0)
/\E(performed(a0),Ta0_1)/\Ta0_1>Ta0.

H(performed(a0),Ta0)
--->E(performed(a1),Ta1)/\Ta1>Ta0/\EN(performed(a0),Ta0_1)/\Ta0_1>Ta0/\Ta0_1<Ta1.

H(performed(a1),Ta1)
--->EN(performed(a1),Ta1_1)/\Ta1_1>Ta1.