Let a↖{→} , b↖{→} , c↖{→ } are three vectors along the adjacent edges of a tetrahedron, if |a↖{→}| = |b↖{→}| = |c↖{→}| = 2 and a↖{→}.b↖{→} = b↖{→}.c↖{→} = c↖{→}.a↖{→} = 1 , then volume of tetrahedron is

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