Bigger network converges in 160 steps

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Episode 10      Last length:    13      Average length: 23.80
Episode 20      Last length:    30      Average length: 21.50
Episode 30      Last length:    30      Average length: 23.03
Episode 40      Last length:    32      Average length: 26.90
Episode 50      Last length:    38      Average length: 28.96
Episode 60      Last length:    23      Average length: 33.52
Episode 70      Last length:    40      Average length: 34.04
Episode 80      Last length:    59      Average length: 38.11
Episode 90      Last length:   107      Average length: 42.99
Episode 100     Last length:   130      Average length: 47.83
Episode 110     Last length:    50      Average length: 55.59
Episode 120     Last length:   280      Average length: 64.62
Episode 130     Last length:   115      Average length: 77.30
Episode 140     Last length:   150      Average length: 85.41
Episode 150     Last length:   211      Average length: 94.97
Episode 160     Last length:   502      Average length: 106.66
Episode 170     Last length:   298      Average length: 122.71