4
print(d(c),": ",key(i),nl())
7
print(" ",d(c2),": ",key(f),nl())
11
print(" ",d(c2),": ",key(f)," ",key(s),nl())
15
print(" ",d(c2),": ",key(s)," ",key(f),nl())
19
print(" ",d(c2),": ",key(m)," ",key(f),nl())
23
print(" ",d(c2),": ",key(fa)," ",key(f),nl())