code improvement
Merge branch 'master' of github.com:ducreyna/zombie-simulator
Merge branch 'master' of github.com:ducreyna/zombie-simulator
Merge branch 'master' of github.com:ducreyna/zombie-simulator
Merge branch 'master' of github.com:ducreyna/zombie-simulator
Merge branch 'master' of github.com:ducreyna/zombie-simulator
bug fix
Merge branch 'master' of github.com:ducreyna/zombie-simulator
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