How to make a button in which other buttons are under the chat in a telegram bot?

Question

Python

I want to make the lesson schedule a button that will have buttons for Monday, Tuesday, Wednesday, and so on. I already have one button and I basically know how to make them:
from aiogram.types import ReplyKeyboardMarkup, KeyboardButton, ReplyKeyboardRemove

b1 = KeyboardButton('/Call_Schedule')

kb_client = ReplyKeyboardMarkup()

kb_client.add(b1)

But how do I make a button with other buttons, I xs tell me please