(Jon of the Clue Crew walks with crutches.)  Crutches are an example of a simple lever; the tip of the crutch acts as this point on whcih a lever turns
The trade system can be viewed as a commodity chain in 
which traders act as ...... the crippled can walk without crutches and the shy can 
improve their... [DOC] [TLE] Ship & Shipbuilding Terminology, complete terminology database ... [PAR] Astern: Any distance behind a ship, as opposed to a-head, which is before her.