Clinical is related to Depression. Depression is related to Valley. Valley is related to Desert. 
Little is related to Pale. Pale is similar to Light. Light is related to Energy. Energy is related to Electrical. 
Clinical <--RelatedTo--> Depression <--RelatedTo--> Valley <--RelatedTo--> Desert 
Little <--RelatedTo--> Pale <--SimilarTo--> Light <--RelatedTo--> Energy <--RelatedTo--> Electrical 