Explicit concrete examples of k-affinoid algebras

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I am having some troubles understanding $k$-affinoid algebras (where ($k$, |.|) is a complete, non Archimedean field, |.| is not trivial) and i am looking for some more concrete and particular examples for better understanding. I was wondering if we can find some $k$-affinoid algebras $(A,||.||)$ where :

  1. ||.|| is not power multiplicative
  2. ||.|| is Archimedean.
  3. $A$ is reduced and ||.|| is not multiplicative.

An example or a construction would really help, thanks