Dictionary
were optional
noun
Something that is not compulsory, especially part of an academic course.
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Exact(60)
The producers said that the last two weeks of the originally announced run were optional and that they had decided not to exercise the option.
Prices were optional.
Shirts were optional.
Holy days of obligation were optional.
In grade 12 the subjects were optional.
The state had contended the services were optional.
They asked Ms. Bailey whether the headsets were optional.
The runs, he had told us at orientation, were optional.
So buses were optional and only 15 students signed up.
The theme was the hula hoop; hoop skirts were optional.
Lessons were optional, and children were encouraged to choose their own activities.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com