axiom
	A(144) S(5) 
	P(0,0,0.7) p
	P(1,0,0) p
	P(0,1,0) p
	P(1,1,0) p
	P(0.8,0,0.4) p;

rules 5
	p= F S(S/(1+tau)) pppp S(S*(1+tau)) F;
end

rules 1
	p= F+F;
end