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