nav = { up = {}, down = {}, left = {}, right = {}, confirm = {} }
nav.up[keys.up] = 1
nav.up[keys.w] = 1
nav.up[keys.f] = 1
nav.left[keys.left] = 1
nav.left[keys.a] = 1
nav.left[keys.r] = 1
nav.down[keys.down] = 1
nav.down[keys.s] = 1
nav.right[keys.right] = 1
nav.right[keys.d] = 1
nav.right[keys.t] = 1
nav.confirm[keys.enter] = 1
nav.confirm[keys.space] = 1