Start now. Prove the value of Rules.

A common rule pattern that occurs in automobile insurance deals with analysing the vehicle-driver relationship.
In many households there are several cars and several drivers and each car may be driven by any of the drivers.
Insurance policies typically need to know the percentage drivership for each vehicle (which of course must add to 100%)
This rule model shows a simplified vocabulary (using a many-to-many associatin) and rulesheet for implementing this rule.
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Fetures: bi-directional associations, many-to-many associations