Q.2. Name the line given in all possible (twelve) ways, choosing only two letters at a time from the four given.

\(\overleftrightarrow {AB} \) , \(\overleftrightarrow {AC} \) \(\overleftrightarrow {AD} \) ,\(\overleftrightarrow {BC} \) , \(\overleftrightarrow {BD} \) ,\(\overleftrightarrow {CD} \) , \(\overleftrightarrow {BA} \) ,\(\overleftrightarrow {CA} \) , \(\overleftrightarrow {DA} \) ,\(\overleftrightarrow {CB} \) , \(\overleftrightarrow {DB} \) ,\(\overleftrightarrow {DC} \) ,