Drawing Conundrums
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Ah, we used to play that when I was a child.

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Csaba, you are still a child ... so continue playing

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Flame war
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This one is slightly mored difficult.
But then try the one with the extra 'flap' shown dotted... -
That was fast Gilles

I can imagine some hair pulling going on in the background with TIG's envelopes

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TIG's is not possible if you want the fourth triangle, too. It is for the three of them.
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I'm stuck with the extra lap.I'll give it a try later.

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I know it's not possible with 4 flaps !
You'll always have a line left over that requires a re-trace!

I was being cruel
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Here's the "5 rooms puzzle"
The object of the puzzle is to draw a continuous [flat 2d] line that intersects each "wall" of the diagram only once.
This example fails as the wall marked with the O is not intersected...Officially it's "unsolvable"... but there is a tricky solution [that doesn't involve 3d or wormholes!]
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Spelling Conondrum.

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Cooldn't resist -
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I showed you that one when I was in Hungary

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Nope. And anyway, how could you remember?

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After all, this is a 3D application forum!

(The alignment could be nicer though...
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I should have just burned them.
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