Level 72 Level 74
Level 73

Unit 75:I can use suffixes

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Infallible, some things that are so well designed and can`t go wrong or be used wrongly.
Tax free
Earning that you don’t have to pay tax on.
Inflation-proof saving
The saving that is safe against the inflation.
Oven proof
Able to be used safely inside an oven, resistant to heat.
Interest free
Kind of loan that you don’t have to pay interest on it.
A force that pulls on other ferromagnetic materials.