“…If in Step 1 we consider n 9,6 = 0 or n 9,6 = 1, then at least one of the rules r 6,3 or r 6,10 cannot be applied as a c is missing and then in the corresponding hierarchy of compartments the message O is not received. 4 The multiset associated with region 6 becomes {3, 9, 9 , O}, where 3 is the non-visited compartment together with its neighbours.…”