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You will most likely remove some of the buds for next year if you prune now. What I would do is explain this to the customer, and then tell them that you will do a light pruning now just to neaten them up, and then next spring when they are done blooming, go ahead and prune them hard.
If your customer can deal without their lilac blooms next spring, put them on the winter pruning list and have at it.
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