(2/3+3/4+4/5)+(1/6+2/7+3/8)+(5/8+5/7+5/6)+(1/5+1/4+1/3)=
=(2/3+1/3)+(3/4+1/4)+(4/5+1/5)*(1/6+5/6)+(2/7+5/7)+(3/8+5/8)=
=3/3+4/4+5/5+6/6+7/7+8/8=1+1+1+1+1+1=6
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(2/3+3/4+4/5)+(1/6+2/7+3/8)+(5/8+5/7+5/6)+(1/5+1/4+1/3)=
=(2/3+1/3)+(3/4+1/4)+(4/5+1/5)*(1/6+5/6)+(2/7+5/7)+(3/8+5/8)=
=3/3+4/4+5/5+6/6+7/7+8/8=1+1+1+1+1+1=6