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I've read if it still doesn't break free with rocking backwards in 3rd gear, you can also open the transmission inspection cover and use a pry bar to try to turn the engine in the reverse direction (use a board to pry against as you don't want to pry against the bell housing for risk of damaging it.)
If it does break free but you find it's happening more frequent, you may want to lubricate the bendix on the starter (not too much but just enough to allow free movement)