The rules that use the category "<det-indef-sing>" are:

<new_area>

<det-indef-sing> <area_name>

<new_line>

<det-indef-sing> <color> <line_type-sing>

<det-indef-sing> <color> line

<det-indef-sing> <line_type-sing>

<det-indef-sing> line

<new_unit>

<det-indef-sing> <ship-creatable-sing>

<det-indef-sing> <vehicle-creatable-sing>

<new_point>

<det-indef-sing> <point_type-sing>