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Question
Name the line given in all possible (twelve) ways, choosing only two letters at a time from the four given.
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Solution
\[\overleftrightarrow{AB}, \overleftrightarrow{BC}, \overleftrightarrow{CD}, \overleftrightarrow{BA}, \overleftrightarrow{CB}, \overleftrightarrow{DC}, \overleftrightarrow{AD}, \overleftrightarrow{DA}, \overleftrightarrow{AC}, \overleftrightarrow{CA}, \overleftrightarrow{BD}, \overleftrightarrow{DB}\]
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