def reverse$\_$arithmetic$\_$sequence$($first$,$ difference, terms$)$: # Check if all parameters are integers $($in either int or str format$)$ if not $($isinstance$($first$,($int$,$ str$))$ and isinstance$($difference$,($int$,$ str$))$ and isinstance$($terms$,($int$,$ str$)))$: return None # Convert parameters to integers first $=$ int$($first$)$ difference $=$ int$($difference$)$ terms $=$ int$($terms$)$ # Validate the parameters if not $(50<=$ first $<=200)$ or not $(1<$ difference $<=10)$ or not $(5<=$ terms $<=100)$: return False # Generate the sequence sequence $=[$first $-$ difference $*$ i for i in range$($terms$)]$ return sequence# Call the code to run the doctestsimport doctestdoctest.testmod$($verbose$=$True$)$