On the Subject of Puzzle Battle

It's quite simple really. Professor, I challenge you to a battle of wits!

To prove your identity, Big Luke wants you to solve a puzzle.

Presented are four face-down playing cards, each with different backs. Each card may either be a Spade, a Heart, a Club or a Diamond, and it is your goal to find the Spade card. There will always be exactly one card of each suit.

Each card back represents a rule that the cards follow (listed below).

Select the card you think is the Spade, then press OK! to submit your answer. If correct, the module will solve; if incorrect, the module will strike.

Card Back	Rule	Card Back	Rule
	A heart is next to a club.		A heart is not next to a club.
	A club is next to a diamond.		A club is not next to a diamond.
	A diamond is next to a heart.		A diamond is not next to a heart.

Card Back	Rule	Card Back	Rule
	A heart is directly to the left of a club.		A heart is directly to the left of a diamond.
	A club is directly to the left of a diamond.		A club is directly to the left of a heart.
	A diamond is directly to the left of a heart.		A diamond is directly to the left of a club.
	A spade is next to a heart.		A spade is not next to a heart.
	A spade is next to a club.		A spade is not next to a club.
	A spade is next to a diamond.		A spade is not next to a diamond.

Card Back	Rule	Card Back	Rule
	One of the cards on the far left or far right is a heart.		None of the cards on the far left or far right are hearts.
	One of the cards on the far left or far right is a club.		None of the cards on the far left or far right are clubs.
	One of the cards on the far left or far right is a diamond.		None of the cards on the far left or far right are diamonds.
	Always applies.