Combination stair
Take a look at your staircase. Let's say it has 10 stairs, and each stair can be either wooden or carpeted.
A combination stair would be one where you have lots of different options for what the stairs look like. Like if you could have all the stairs be wooden, or all the stairs be carpeted, or maybe every other stair is different, one wooden then one carpeted
Think about building a tower with blocks. You can stack them in different ways to make lots of different towers. With a combination stair, you can make lots of different stairs using different patterns of wooden and carpeted stairs.
So a combination stair is just a fancy way of saying you can mix and match different types of stairs to get a unique look.
A combination stair would be one where you have lots of different options for what the stairs look like. Like if you could have all the stairs be wooden, or all the stairs be carpeted, or maybe every other stair is different, one wooden then one carpeted
Think about building a tower with blocks. You can stack them in different ways to make lots of different towers. With a combination stair, you can make lots of different stairs using different patterns of wooden and carpeted stairs.
So a combination stair is just a fancy way of saying you can mix and match different types of stairs to get a unique look.