The carterian product `P xx P` has 16 elements among which two elements are (a, b) and (c, d). Find the set P and the remaining elements of `P xx P`.

Explanation

To solve the problem, we need to find the set \( P \) and the remaining elements of the Cartesian product \( P \times P \) given that it has 16 elements and two of them are \( (a, b) \) and \( (c, d) \).

### Step-by-Step Solution:

1. **Understanding the Cartesian Product**:
The Cartesian product \( P \times P \) consists of all possible ordered pairs where the first element comes from set \( P \) and the second element also comes from set \( P \). If \( P \) has \( n \) elements, then the number of elements in \( P \times P \) is \( n^2 \).

2. **Setting Up the Equation**:
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