A halway has a sign that says "PORT DU CASQUE OBLIGATOIRE" and some graffiti.
There is a mandatory bicycle helmet sign in the hallway.
'PORT DU CASQUE OBLIGATOIRE' means mandatory bicycle helmet.
exists e2 e1 x1 x2 x3 x4 x5 x6 x7 x8 x9.(ne_nam_obligatoire(x5) & (x5 = x8) & ne_nam_casque(x8) & (x5 = x7) & ne_nam_du(x7) & (x5 = x6) & ne_nam_port(x6) & Theme(e2,x2) & Actor(e2,x1) & v_have(e2) & Theme(e1,x4) & Actor(e1,x3) & v_say(e1) & subset_of(x9,x4) & n_graffitus(x9) & subset_of(x5,x4) & (x2 = x3) & n_sign(x2) & n_halway(x1))
exists p1 x1 x5.(n_hallway(x5) & exists s1 x2 x3 x4.((x1 = x2) & in(x2,x5) & n_sign(x2) & of(x2,x4) & n_helmet(x4) & of(x2,x3) & n_bicycle(x3) & a_mandatory(s1) & Theme(s1,x2)))