A bicyclist is in the mud walking their bicycle.
There is mud.
There is a bicyclist who walking their bicycle in the mud.
exists p1 x1 x2 x4.(n_bicycle(x4) & of(x4,x2) & n_thing(x2) & n_mud(x2) & exists e1 x3.(in(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_walk(e1) & (x2 = x3)) & n_bicyclist(x1))
exists p1 x1 x2.((x1 = x2) & n_mud(x2))