John is a student of a University. He lives in a bed-sitting studio near the University. He has an arrangement with the owner of the studio Mary, described as a licence, whereby Mary gives John the right to occupy the studio for one year. Mary reserves the right to enter the studio at any time and retains a key. Mary visits the studio one day and sees John's posters on the wall supporting the Campaign to legalize the smoking of Marijuana (a dangerous drug). Mary immediately gives John notice to vacate the studio saying "I won't allow you making trouble on my property". Advise John.
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