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#!/usr/bin/env ruby
a = (5..10)
b = (8..9)
def split_range a, b, index=0
return nil if a==b
aa = a.to_a
begin_split = b.first
end_split = b.last
p1 = aa[0..aa.index([begin_split-1,aa.first].max)]
p2 = aa[aa.index([end_split+1, aa.last].min)..aa.last]
if begin_split > a.first && end_split < a.last
return [(p1.first..p1.last), "X#{index}", (p2.first..p2.last)]
elsif begin_split == a.first
return ["X#{index}", (p2.first..p2.last)]
elsif end_split == a.last
return [(p1.first..p1.last), "X#{index}"]
end
return nil
end
puts split_range(a, b).to_s
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