A macro cell describes {HEAD ~ an arrangement} of cells that may be incorporated into an integrated circuit design and that may include a set of clocked devices and {TAIL ~ a clock tree subtree} for delivering a clock signal to the sinks 
include
A macro cell describes { HEAD ~ an arrangement } of cells that may be incorporated into an integrated circuit design and that may include a set of clocked devices and { TAIL ~ a clock tree subtree } for delivering a clock signal to the sinks
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH