Are there any items you can make in which no formula for it exists?

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In Ni No Kuni, when you get the cauldron, you can make items using the formula you currently have or use the Mix and Match option.
Formulae are usually given to you but can you make an item where the formula for it is not given to you? Like making secret items.
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How do you make sure there are no formulas in Excel?
To hide formulas:How do you remove formulas but keep value?
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The process for hiding your formulas and functions is quite simple.What is Xlookup?
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Images: Julia Avamotive, RF._.studio, Roger Brown, Alexander Grigorian