Conductor leading his orchestra.
An orchestra follows the conductor.
A leader such as a conductor must have a group that follows.
exists e1 x1 x2.(n_orchestra(x2) & of(x2,x1) & n_male(x1) & ne_nam_conductor(x1) & Theme(e1,x2) & Actor(e1,x1) & v_lead(e1))
exists e1 x1 x2.(n_conductor(x2) & Theme(e1,x2) & Actor(e1,x1) & v_follow(e1) & n_orchestra(x1))