Thigh is a type of Limb. Limb is a type of Part. 
Transmission is derived from Mission. Transmission is related to Call. Call is related to Activity. Activity is related to Think. 
Thigh --IsA--> Limb --IsA--> Part 
Mission <--DerivedFrom-- Transmission <--RelatedTo--> Call <--RelatedTo--> Activity <--RelatedTo--> Think 