 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=^=    ::  ::  ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::