A nano line is a group of nano formulas which do not stack with each other. Nano formulas in a nano line usually have similar effect types, with nanos having larger NCU costs usually having higher priority. A nano of the same nano line and lower priority than any nano affecting the target will fail to execute on the target. Otherwise, a nano of the same nano line and higher priority than any nano affecting the target will terminate and replace lower priority nanos sharing a nano line. Nano formulas within a nano line may also share a cooldown.