b main
start
n
n
n
n
n
n
q
b main
tui enable
n
start
n
n
s
n
n
n
n
n
n
n
n
n
n
s
n
n
n
n
n
n
n
s
n
n
n
n
n
n
n
s
n
n
n
n
n
q
b main
tui enable
start
b rec
c
n
n
n
n
n
n
n
s
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
p c[i]
p n - c[i]
n
n
n
n
n
p cache[n]
q