L tr

L trL trL trL trL trL tr
L trL trL trL trL trL tr
L trL trL trL trL trL trL trL trL trL trL trL trL trL trL trL trL trL trL trL trL trL trL trL trL trL trL trL trL trL trL trL trL trL trL trL tr