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Try the following systems:

# Lorenz Atractor
dx = 10*(y-x)
dy = x*(28-(z+27))-y
dz = x*y-8/3*(z+27)

# Rössler Atractor
dx = -30*(y+4*z)
dy = 30*(x+0.1*y)
dz = 15/8+12*z*(x-35)