node Ctrl
  /* Controller observations 
  */
  flow   rate : [0,2][3];
         level : [0,nbSensors];
  /* The 27 commands of the controller
  * d for dec, i for inc and n for nop
  */
  event ddd, ddi, ddn, did, dii, din, dnd, dni, dnn,
        idd, idi, idn, iid, iii, iin, ind, ini, inn,
	ndd, ndi, ndn, nid, nii, nin, nnd, nni, nnn;
  trans true |- ddd, ddi, ddn, did, dii, din, dnd, dni, dnn,
                idd, idi, idn, iid, iii, iin, ind, ini, inn,
	        ndd, ndi, ndn, nid, nii, nin, nnd, nni, nnn
		-> ;
edon