Bedroom is related to Alarm. Alarm is a type of Device. Lift is a type of Device. Lift is a type of Aid. 
Patch is related to Cover. Cover is related to Fabric. 
Bedroom <--RelatedTo--> Alarm --IsA--> Device <--IsA-- Lift --IsA--> Aid 
Patch <--RelatedTo--> Cover <--RelatedTo--> Fabric 