Noticed the same thing, but only in the third, cleanest version. No better way to illustrate its merits relative to the initial two versions. Spoiler alert: fl

Noticed the same thing, but only in the third, cleanest version. No better way to illustrate its merits relative to the initial two versions. Spoiler alert: flipping that single bit from i=0 to i=1 might deserve a little comment of the "why" category.