What comes before, after, and in between for the following numbers?

Here are the answers for "After, Before and In Between":

1. What comes before.

• a) $\boxed{\text{3636}}$, 3637
• b) $\boxed{\text{4861}}$, 4862
• c) $\boxed{\text{5653}}$, 5654
• d) $\boxed{\text{6520}}$, 6521

2. What comes after.

• a) 1314, $\boxed{\text{1315}}$
• b) 2791, $\boxed{\text{2792}}$
• c) 3942, $\boxed{\text{3943}}$
• d) 4699, $\boxed{\text{4700}}$

3. What comes in between.

• a) 2122, $\boxed{\text{2123}}$, 2124
• b) 4314, $\boxed{\text{4315}}$, 4317