import numpy as np

p = np.random.random()
def unfair_flip(p=p):
    if np.random.random() > p:
        return "Heads"
    return "Tails"

def fair_flip():
    if np.random.random() > 0.5:
        return "Heads"
    return "Tails"

def known_unfair_flip():
    if np.random.random() > 0.76:
        return "Heads"
    return "Tails"