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

<contact_type-simple>

<contact_type_nom-sing>

<digit-not_zero-sing> <contact_type_nom-sing>

<ordinal-sing> <contact_type_nom-sing>

<contact_type>

<contact_type_nom-sing>

<digit-not_zero-sing> <contact_type_nom-sing>

<ordinal-sing> <contact_type_nom-sing>