As one way to use the BL/BL screen,
I like see if a runner, who figures to be 4/1 or > at post time,
compares in their 1st or 2nd best line versus the 2nd, 3rd, or 4th best line
for one of the 1st two public betting choices.
If I don't like what I see, it's either key one of those obvious runners
in vertical or horizontal exotics, or just move on to the next race.
Most of the time.
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