grammar: add include directive for plp's #125

	name: Tests
	on: [push]
	jobs:
	test-linux:
	runs-on: ubuntu-22.04
	steps:
	- uses: actions/checkout@v3
	with:
	submodules: true
	- name: Set up Python
	uses: actions/setup-python@v4
	with:
	python-version: "3.x"
	cache: "pip"
	- name: Add system dependencies
	run: \|
	sudo add-apt-repository ppa:potassco/stable
	sudo apt update
	sudo apt install clingo libclingo-dev gcc python3-build
	- name: Add Python dependencies
	run: \|
	python -m pip install --upgrade pip setuptools build
	pip install -r requirements.txt
	pip install torch torchvision
	- name: Build pasp
	run: \|
	python -m build --sdist
	pip install dist/*.tar.gz
	- name: Test pasp
	run: \|
	python setup.py test

Provide feedback