Athlete is related to Type. Type is related to Bone. 
Serious is related to Disease. Disease is related to Severe. Severe is a synonym of Bad. Bad is related to Bitter. 
Athlete <--RelatedTo--> Type <--RelatedTo--> Bone 
Serious <--RelatedTo--> Disease <--RelatedTo--> Severe <--Synonym--> Bad <--RelatedTo--> Bitter 