A four-digit PIN code is required for a bank's ATM card. An encrypted code is stored with the bank account instead of storing the card's PIN code. For example, the PIN code 1234 forms the code matrix [32]. The code matrix C is then 4 multiplied by a key matrix K to obtain the encrypted matrix E. In other words, E = C · K. To determine the original PIN code from an encrypted code, the bank uses C = E · K¯¹. Suppose the key matrix is given by [1]. Determine the PIN code (in terms of a matrix) if the encrypted code is 4, 1, 4, 1.