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di misalkan:
a=1
b=2
c=3
d=6
jadi= 1+2+3+6=12
tapi kalau bukan berurutan, nnti aku edit
a= 36/bcd
b= 36/acd
c= 36/abd
d= 36/abc
a+b+c+d= 36/bcd + 36/acd + 36/abd + 36/abc