Sentence examples for this step is compulsory from inspiring English sources

This step is compulsory.

This step is compulsory if you don't already have one.

Although this step is not compulsory, it allows NERVE to rank VCs from most to least represented in the compared prokaryotic proteome in the html table presenting the selection set (see below).

This step is not compulsory; you don't have to physically be like Sam to be able to act like him, but you can do this step if you want to.

This step is vital.

This step is important.

This step is simple.

This step is key.

This step is optional.

This step is tricky.

This step is obvious.