% Grammar 4.2: A grammar written in BH-GRN

:-op(1100, xfx, --->).
:-op(1100, xfx, ===>).

s ---> [np, vp].
vp ---> [v].
vp ---> [v, np].

np ===> [toby].
np ===> [scotch].
np ===> [drinks].
v ===> [drinks].