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