while c1:
    x = 1
else:
    y = 1

while c2:
    a = 1
    break
    b = 1
else:
    c = 1

while c3:
    m = 1
    if m:
        break
    n = 1
else:
    o = 1

while c4:
    m = 1
    if m:
        break