 0            / 0            / 1              1              1                               '''''                     '''''''''''''''''''''''''''''''''''''''''?'''''''''''''''''''?''''''''4???444??4444444??444???4''''''4???444??4444444??444???4''''''''?'''''''''''''''''''?'''''''''''''''''''''''''''''''''''''''''                     '''''                                                                                             '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''=44444444:::444444444=''''==44==4     4:::::4      4==4==== 4444     4444444      4444==     ?==?   ???????   ?==?         ?6666?  ?:::::?  ?6666?    ==  ?====?  ?:666:?  ?====?  ====  ?I==I?  ?:666:?  ?I==I?  ==    ??????  ?:::::?  ??????                ???????            ==  ======           ======  ====  ======           ======  ==                               ::  ::  ::    ===    ::  ::  ::::  ::  ::   d=^=    ::  ::  ::