Firefighters relax after responding to an emergency.
A group of firefighters have the day off.
If firefighters relax after responding to an emergency, they must have been working and could not have had the day off.
exists e1 e2 x1 x2.(after(e1,e2) & to(e2,x2) & n_emergency(x2) & Actor(e2,x1) & v_respond(e2) & Actor(e1,x1) & v_relax(e1) & n_firefighter(x1))
exists e1 s1 x1 x2 x3.(n_day(x3) & a_off(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x1) & v_have(e1) & of(x1,x2) & n_firefighter(x2) & n_group(x1))