Hello, and welcome to today's programming practice session! Are you prepared to delve into an exciting task involving nested loops and arrays in Scala? Our focus today will be on mastering the use of nested loops to search two lists. You're about to embark on a fascinating journey of hands-on learning. Let's get started!

Imagine you've received two lists of integers. You'll need to write a function that locates and returns pairs of integers. The first element of the pair will come from the first list, with the second coming from the second list. It's important to note that the first element must be less than the second.

The order of pairs in your result should follow the order in which they appear in the input lists. For instance, given the lists List(1, 3, 7) and List(2, 8, 9), the function should return List((1, 2), (1, 8), (1, 9), (3, 8), (3, 9), (7, 8), (7, 9)). It's a challenge if no pairs exist, or if any input list is empty. Let's dissect this task to unravel the solution together!

Before we dive into writing code, let's break down the problem. It appears to be an ideal candidate for nested looping.

Begin by initializing an empty list called result, which will store our pairs. We will use a ListBuffer for its mutability.