Write atleast five different types of stairs according to layout and explain each of them indetail

Five types of stairs according to layout is:

1. Spiral: It consists of a single pole around which a compact design is centered.
2. Straight: It has a single linear flight without changing in the direction
3. L- Shaped: In these stairs take a 90-degree turn left or right after the landing at the same point.
4. U- Shaped: In U-Shaped stairs the two parallel flights get separated by the landing.
5. Curved: It has no landing, these stairs are continuous.