H(start,0)
--->E(performed(a1),Ta1).

H(performed(a1),Ta1)
--->E(performed(a2),Ta2)/\Ta2>Ta1
\/E(performed(a3),Ta3)/\Ta3>Ta1.

H(performed(a2),Ta2)
--->E(performed(a4),Ta4)/\Ta4>Ta2
\/E(performed(a5),Ta5)/\Ta5>Ta2.

H(performed(a3),Ta3)
--->E(performed(a6),Ta6)/\Ta6>Ta3
\/E(performed(a7),Ta7)/\Ta7>Ta3.

H(performed(a4),Ta4)
--->EN(performed(a1),Ta1)/\Ta1<Ta4.

H(performed(a5),Ta5)
--->EN(performed(a1),Ta1)/\Ta1<Ta5.

H(performed(a6),Ta6)
--->EN(performed(a1),Ta1)/\Ta1<Ta6.

H(performed(a7),Ta7)
--->EN(performed(a1),Ta1)/\Ta1<Ta7.

