Hipster performs on the acoustic guitar.
The guitar is not electric.
Acoustic means not electric.
exists e1 s1 x1 x2.(n_guitar(x2) & a_acoustic(s1) & Theme(s1,x2) & ne_nam_hipster(x1) & on(e1,x2) & Actor(e1,x1) & v_perform(e1))
exists x1.(n_guitar(x1) & -exists s1.(Theme(s1,x1) & a_electric(s1)))