Script is a type of Write. Marker can be used for Write. Marker is related to Birthday. 
Remark is related to Reply. Reply is related to Note. Note is related to Mark. 
Script --IsA--> Write <--UsedFor-- Marker <--RelatedTo--> Birthday 
Remark <--RelatedTo--> Reply <--RelatedTo--> Note <--RelatedTo--> Mark 