Common x common = common or uncommon
Common x uncommon = rare
common x rare = anything wink
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uncommon x uncommon = common or uncommon
Uncommon x rare = anything
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Rare x Rare = anything


In other words, rare x anything = anything
rare and rare can even make common or uncommon

There is a seceret pattern:
Click to reveal..
c, r, u, r, and so on
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Glue sticks, fire burns, water evaporates, and villagers die off and we form attachments to them.