mental tasks <of> varying difficulty

park sang joon

Senior Member
Smith and his coworkers taught a group of college students two mental tasks of varying difficulty on the same day: The easy one was learning to associate pairs of words; the hard one was the Wff'n'Proof logic game, which requires elaborate mental gymnastics.
[Source: Reading for Results Ninth Edition by Laraine Flemming]
I'd like to know here if "of" means "having."
Thank you in advance for your help.
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