Tie is related to Neck. Neck is related to Flexible. Flexible is a synonym of Variable. Variable is part of Formula. 
Lecture is related to Educational. Educational is derived from Education. 
Tie <--RelatedTo--> Neck <--RelatedTo--> Flexible <--Synonym--> Variable --PartOf--> Formula 
Lecture <--RelatedTo--> Educational --DerivedFrom--> Education 