2. 善变者

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Toggler Brain Teaser

This brain teaser in this video

is once again not one that I made up.

I actually don't remember the first time that I heard it.

I think it was in the back of a magazine.

I want to say Scientific American.

And me and a bunch of buddies,

we were traveling through Europe.

And it kind of became our pastime

to do these brain teasers in the back of magazines.

And just so you know,

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