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Weekend special on file format identification tools

The weather’s been great lately, so here’s a special offer, just through March 13, on my Udemy course on file format identification tools: Just $12 with the coupon MARCH11! The list price is $28.

This also celebrates Udemy’s fixing a bug which I reported, which was making short-term coupons impossible as a side effect of the price changes being imposed on April 4.

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