from typing import Tuple


def get_SIR() -> Tuple[list, list]:
    beta = 0.2
    gamma = 0.09
    state_names = ["sain", "infecté", "rétabli"]
    relations = (
        lambda x: None,  ### To Complete###
        lambda x: None,  ### To Complete###
        lambda x: None,  ### To Complete###
    )
    return (state_names, relations)