That's the part that made the least sense to me. If he doesn't actually mean to rewrite it twice, what does he _mean_? Copy and paste the old code? Rewrite half

That's the part that made the least sense to me. If he doesn't actually mean to rewrite it twice, what does he _mean_? Copy and paste the old code? Rewrite half it? Typically (my "intelligent application") I will read the code I wrote yesterday and make improvements, is that sufficient?