size:  0 capacity:  0                                                                                                                                                                     
size:  1 capacity:  1                                                                                                                                                                     
size:  2 capacity:  2                                                                                                                                                                     
size:  3 capacity:  4                                                                                                                                                                     
size:  4 capacity:  4                                                                                                                                                                     
size:  5 capacity:  8                                                                                                                                                                     
size:  6 capacity:  8                                                                                                                                                                     
size:  7 capacity:  8                                                                                                                                                                     
size:  8 capacity:  8                                                                                                                                                                     
size:  9 capacity: 16                                                                                                                                                                     
size: 10 capacity: 16                                                                                                                                                                     
size: 11 capacity: 16                                                                                                                                                                     
size: 12 capacity: 16                                                                                                                                                                     
size: 13 capacity: 16
size: 14 capacity: 16
size: 15 capacity: 16
size: 16 capacity: 16
size: 17 capacity: 32
size: 18 capacity: 32
size: 19 capacity: 32
size: 20 capacity: 32