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,,,,,,,,, <> Update 2020.09.20 | | UP () : (1/3) : () || | || (:) (:) :() :() : : 2 +++... (2/3) || || | | || || :() :() (3/3) 105 80 55 30 () 3 2 1 : 8 4 2 :123 22 42 4 33 (1/2) || | || | | | | | | | | | | A B C () :ABC :BCA (2/2) || | || | | | | | | | | | D E F () :DEF :EFD () () || || || | | | | | || || | | || | | || | | | | | | | | | | | | || || || .PDF : :() : ... () / || || || || || || | | | | | | | | | | || || | || || || | || | | || | | || | | | | | | | | | | | | | | | | || || || || || || | || || | | || || | | | | | | | | | | | | | | | | | | | | | | | () () 13 :1 :3 ()2 42 4 C 2 = 4 P 2 /2!=4x3/2=6 (1~4) | | | | || | | || : () () () (+) (1/2) // () || | || | | | | | | | | | | A B C ABCAC (ACAC) AC() () :(:) (A:+B)|(:A+B+C)|(B:A++C)|(C:+B) C A () () (2/2) || | || | | | | | | | | | D E F DEFDF (DFDF) DF () :EFD :(:) (D:+E)|(:D+E+F)|(E:D++F)|(F:+E) F D () () 1~14 1 (=) 2 (=) || | || || | | | | | | | | | | | || | | | || | | | | || || || || || | | || || || || || | | || (2) 2 2 2 ()1 
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