code: def S2playground(extent):
  	
  	lo = int(extent[0])
  	lo -= (lo - 729273613) % 6370
  	hi = int(extent[1]) + 1
  	return segments.segmentlist(segments.segment(t, t + 600) for t in range(lo, hi, 6370)) & segments.segmentlist([extent])
docs: Return a segmentlist identifying the S2 playground times within the
  	interval defined by the segment extent.
  
  	Example:
  
  	>>> from pycbc_glue import segments
  	>>> S2playground(segments.segment(874000000, 874010000))
  	[segment(874000013, 874000613), segment(874006383, 874006983)]