Yes, I could make that set right now scy and scm. I would have difficulty with the 1:20 if lcm. Retired pro, top-level triathlon swimmer, but not collegiate level swimmer. My IM swims were typically 50ish as in 50:ish. I've been swimming 2x3,000 each week since I retired 4 years ago.
Another set that one of our ex-coaches had us do was...
1, 1, 1, 2, 2, 2, 3, 3, 3 x 100 for a total of 18 with a descending interval. You could add a 4, 4, 4 and get a total of 30.
The send offs were usually either 130, 125, 120 or 125, 120, 115 for scm, you'd go 5" faster per 100 if scy. Almost all of the swimmers were 1:05 or faster IM swimmers typically sub-55 for the faster group.
That seems more like a 70.3 or olympic set. I've found that when you get over the 70.3 distance, there was a pretty big discrepancy between some pool swimmers that could do very well on short rest 100s, but did not do well in open water. The Mrs. -JBMarshTX was a good example. She'd be right there on a set of 100s, but I'd be several minutes ahead at the end of an IM and a couple of minutes ahead at the end of a 70.3 or Oly.
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