The rules that use the vocabulary item "c2" are:

<i_f_v-sing>

bmp2 c2

btr-60 c2

c2 lar

lav c2

<i_f_v-pl>

c2 lars

<tank_type>

swa t72 c2

swa t72 tank c2

swa t72-s c2

<i_f_v>

bmp2 c2

btr-60 c2

c2 lar

c2 lars

lav c2

<tank_type-sing>

swa t72 c2

swa t72 tank c2

swa t72-s c2