Think Tank

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The Case of the Missing Card ...

<-- which playing card goes here ?

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Hint 1 : Clubs and Spades (the black suits) are shown in black, Diamonds and Hearts (the red suits) are shown in grey.
Hint 2 : Each column follows the same pattern.
Hint 3 : Each bottom card is the sum of the two above it.
Hint 4 : ♣ ♠ are positive - ♥ ♦ are negative.

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... each square contains a common word or phrase.

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I'm sticking with 'three little pigs' for the final square.

 

I've been trying to work something around the capital letters and 'shift' (key).

 

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(I added the final two hints to the 'Missing Card' one.)

Why do these two pictures actually show pretty much the same things ?

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Okay, the silence is deafening on this last one.

Don't overthink it, just consider what you might call each picture. (The answer is worth the effort.)

One hint - it would have been simpler if the terminal had been called a station instead.

 

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To me, the second picture looks like a crusty bus station.

 

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Okay, what if the first one looked like this :



What does she look like ? What's being emphasized in both those pictures ?

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So close.

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... well, some of you are.

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Hint : I'm a Canadian Anglo-Saxon.