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a[j] - a[i] = d => a[j] = a[i] + d
a[k] - a[j] = d -> a[k] = d + a[j] => d + d + a[i] = a[i] + 2*d;
technically we need just once
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Beautiful Triplets
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a[j] - a[i] = d => a[j] = a[i] + d
a[k] - a[j] = d -> a[k] = d + a[j] => d + d + a[i] = a[i] + 2*d;
technically we need just once