Treebeard's Stumper

Holiday Magic
Put the numbers 1 to 12 on the holiday stars, trees, and wreaths shown below, with one number in each design, so they add up to the same sum in each of these seven ways:The magic sum must be 26. (Why?) How many different ways are there to solve this stumper?
 each of the two center columns (treewreathstree)
 each of the two center rows (starwreathsstar)
 the four stars together
 the four trees together
 the four wreaths together
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