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Would be a tight squeeze but it should be sufficient, the standard cubicle width is 900mm but that's only 189mm larger, shouldn't be a problem
No, something can not be air tight but not water tight.
Have you had sufficient to eat?
The police did not have sufficient evidence to prosecute.
The correct phrase is "sufficient proof".
The meal was sufficient for my sustenance.
Has your account sufficient funds to cover this check?