please help me to fix my graph to see the other line graph of the graph please show the all color line in the graph

import numpy as np

import matplotlib.pyplot as plt

temperature$\_$range $=$ np$.$arange$(16,24,1)$

def Decreasing $($x$)$:

return np$.$maximum$(0,$ np$.$minimum$((16-$ x$)/4,1))$

def Stable $($x$)$:

return np$.$maximum$(0,$ np$.$minimum$($np$.$minimum$(($x $-20)/2,(20-$ x$)/2),1))$

def Increasing $($x$)$:

return np$.$maximum$(0,$ np$.$minimum$((24-$ x$)/4,1))$

plt$.$figure$($figsize$=(10,4))$

plt$.$plot$($temperature$\_$range, Decreasing$($temperature$\_$range$),$ label$=$"Decreasing"$)$

plt$.$plot$($temperature$\_$range, Stable$($temperature$\_$range$),$ label$=$"Stable"$)$

plt$.$plot$($temperature$\_$range, Increasing$($temperature$\_$range$),$ label$=$"Increasing"$)$

plt$.$title$("$Rate of temperature $")$

plt$.$xlabel$("")$

plt$.$ylabel$("$Degree of Membership"$)$

plt$.$legend$()$

plt$.$show$()$