Some things that come in sets are:
*eyeglasses come in pairs
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Days of the week underwear.
Things that are in groups of seven are:Chronicles of Narnia Box Setcolours of the rainbowcontinentsdays of the weekdeadly sinsdwarves ask Snow WhiteHarry Potter Box setHills of RomesacramentssamuraiseassistersvirtuesWonders of the Worldyears of good luck (or bad luck)That holy things are signified by seven is evident from what has been said before respecting the seventh day, or the Sabbath.
Falcon has kat spade vs skirmish has gorge
Five-Headed Dragon does not come in any booster pack, it only comes in special sets of SD09, Dinosaur's Rage.
some sets are black and white and heart gold and soul silver