When your friend Johnny comes over, he has an exact copy of your house built using his own Legos. Johnny makes some changes to his copy and shows you what he did. You can then add those to your house, allow Johnny to add them or discard them and keep the left over Legos for free.
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When your friend Johnny comes over, he has an exact copy of your house built using his own Legos. Johnny makes some changes to his copy and shows you what he did. You can then add those to your house, allow Johnny to add them or discard them and keep the left over Legos for free.