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A semi-closed primary is one in which party-affiliated voters cast votes in their party's primary, and non-affiliated voters can choose which party's primary to vote in.
An open interval, usually written as (2, 4) is any number between 2 and 4 but excluding the two end points. Another way of writing it is {x : 2 < x < 4}. A closed interval includes both end points and a semi-open or semi-closed includes one but not both.
There are four types of line segments: open, closed and semi open (or semi-closed).With an open line segment, neither end-point is included. In terms of inequalities, it would be of the form a < x < b.Closed segment: both end-points are included so that a ≤ x ≤ b.Semi-open, one end-point is included, the other is not.
THis is a semi colon ;
"Show" is open, "and" is closed. O- is open, -pen is closed. "Closed" is closed.