new T(A)
T A:  put O 1
T A:  put O 2
T A:  put O 3
T A:  put O 4
T A:  put O 5
new TT(B)
TT B:  put O 7
TT B:  put O 8
TT B:  put O 9
TT B:  put O 10
TT B:  put O 11
TT B:  got O 7
TT B:  got O 8
TT B:  got O 9
TT B:  got O 10
TT B:  got O 11
TT B:  got O 1
TT B: done.
main: exit
T A:  put O 6
T A:  got O 2
T A:  got O 3
T A:  got O 4
T A:  got O 5
T A:  got O 6
T A: done.