Card Sense

As we approached the next puzzle, we saw several six foot playing cards. Cool and confident were we. With poker playing Aces, Bridge experts, and Hearts champions among us, how could we miss? We saw:


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We thought mightily, we strained, we sweated. None of our answers made sense. We finally took a guess. The correct answer was to take the 5th letter of the word "Heart", the fifth letter of the word "Spade", and the sixth letter of word "Diamond", to come up with ten.