learn more about L-systems here:
L-system - Wikipedia
main.dvi (algorithmicbotany.org)
here are example codes:
starter letter: B
B → B[+B]B[-B]B
Or:
B → BB-[-B+B+B]+[+B-B-B]
starter letter: 3
B → BB
3 → B[+3][-3]B3
have fun,
