s - O - O-O-o- s - i - i-o-O- P - P - P-P-O- P - o - o-i-o- s - O - O-O-o- s - i - i-o-O- P - P - P-P-O- P - o - o-i-Y- s--Y- Y-t-Y- s-i--- i-i- P---- o-O- P---- Y- s-Y-Y- Y-t-Y- s-i--- i-i- P-i-i-- o-O- P---- Y- D---- D-S- s---- S-D- g---- D- S---- Y- D---- D-S- s-s--- S-D- g---- g-D- S---- s-P- s - O