Have lunch does not have a sub-event of knead dough. Get hungry has a sub-event of eat. Read has a sub-event of think. Something be open has a sub-event of hit gorund. Have lunch has a sub-event of eat. Plan vacation has a sub-event of hit gorund. Eat has a sub-event of read. Have lunch does not have a sub-event of temperature drop below zero degree celcius. Eat does not have a sub-event of knead dough. Plan vacation does not have a sub-event of go off on tangent. Think has a sub-event of go off on tangent. Think gives rise to idea. Analyse something has a sub-event of think. Examine thing has a sub-event of read.
Eat has a sub-event of think.