if a(a,b,c,d) means you take the square root of the sum of the terms and a(8,10,13,d)=6,then d= a:5 b:6 …

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if a(a,b,c,d) means you take the square root of the sum of the terms and a(8,10,13,d)=6,then d= a:5 b:6 c:12 d:18 e:36