We know General Grievous was handed his first lightsaber by Count Dooku, it having belonged to Sifo-Dyas. We also know he has four other lightsabers, having belonged to Pablo-Jill, Roron Corobb, Eeth Koth, and Shaak Ti. And we know he has killed numerous Jedi.
But considering he has received at least one lightsaber that had belonged to a Jedi he didn't kill, that he took lightsabers from Jedi he didn't kill, and that he may not have been able to retrieve each and every lightsaber of those he did kill,
How many lightsabers did General Grievous have?