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The rules that use the category "<heading_aspect>" are:

<air_location>

<bearing_range> <air_speed> <altitude> <heading_aspect>

<bearing_range> <air_speed> <heading_aspect>

<bearing_range> <altitude> <air_speed> <heading_aspect>

<bearing_range> <altitude> <heading_aspect>

<bearing_range> <altitude> <heading_aspect> <air_speed>

<bearing_range> <heading_aspect>

<bearing_range> <heading_aspect> <air_speed>