In 1992, this was changed to the optional preferential system currently used.

Either part-time or optional full-time four-wheel-drive systems are available.

An optional system provides a third zone for the rear seat, and the back cabin deserves a separate zone.

The school has an optional boarding system with a comprehensive study program.

Level 1: Power steering, front power windows, and sound system optional.

In addition to these, clubs can be formed which gain their own channels and optional electoral system.

But as I have said, so as not to hold back the others we should bridge this time lag with an optional system.

This optional "premium-support" system would be structured much like the health insurance that Members of Congress receive.

Alternatively, under an optional system failure to register could carry certain penalties or limit remedies available to the right holder.

An optional system called Heroic Opportunities grants bonus effects when players combine their abilities in specific ways.