A multiplicity of teeth are mounted to a beam in {TAIL ~ a comb structure}, with the space between the teeth defining {HEAD ~ slots} 
A multiplicity of teeth are mounted to a beam in { TAIL ~ a comb structure } , with the space between the teeth defining { HEAD ~ slots }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD