Instrument is related to Voice. Voice is related to Throat. Throat is related to Horse. Horse is related to Draft. 
Experiment is related to Technique. Technique is related to Preserve. Preserve is related to Fresh. 
Instrument <--RelatedTo--> Voice <--RelatedTo--> Throat <--RelatedTo--> Horse <--RelatedTo--> Draft 
Experiment <--RelatedTo--> Technique <--RelatedTo--> Preserve <--RelatedTo--> Fresh 