If 5 - 4 = 23, 8 - 1 = 63, 6 -16 = 32, 9 - 9 = 78, 3 - 9 = 6 then 3 - 81 = ?

Given, 5 - 4 = 23, 8 - 1 = 63, 6 -16 = 32, 9 - 9 = 78, 3 - 9 = 6 then 3 - 81 = ? Let's take the first sequence, 5 - 4 = 23 This can be decoded as 5^2 - sqrt(4) = 25 - 2 =23 8 - 1 = 63 This can be decoded as 8^2 - sqrt(1) = 64 - 1 =63 6 - 16 = 32 This can be decoded as 6^2 - sqrt(16) = 36 - 4 =32 9 - 9 = 78 This can be decoded as 9^2 - sqrt(9) = 81 - 3 = 78 Similarly, 3 - 81 = ? This can be decoded as 3^2 - sqrt(81) = 9 - 9 = 0