Ditto what PhilC, les and mac said but I'll add one more thing for the interested. Memorise sets favoured joint angles for IK chains. If you've ever seen a figure where turning on IK makes the knees bend backwards or sideways, this is because memorise has been used incorrectly. To set up IK favoured joint angles, you pose your figure with all of the joints bent in the direction they ought to bend by default, then memorise it.

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