Disclosed herein are cannabinoid receptor ligands of formula wherein A1, A5, Rx, X4, and z are as defined in the specification. The environment control device is positioned to act on a surface of a workpiece at least during a measurement operation to establish a measurement area on the surface of the workpiece substantially unobstructed by fluid. An attachment member of the second air vehicle may attach to a recovery member of the first vehicle while the first vehicle and the second air vehicle are traveling at different velocities. A gas line is installed between the chamber and interior of the gas duct at a point upstream of a discharge point and the purge gas is a branch-off of the duct gas. In one example, the first security context is a UMTS security context and the second security context is a GSM security context. The safety pin comprises a head, a shaft, a distal end and a longitudinal axis starting at the head, extending along the shaft and terminating at the distal end, wherein either or both of the shaft and the distal end are keyed so as to have an element thereon that extends relative to a side of the shaft.