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using Test
subinterval(a0, a1, b0, b1) = a0<= b0 && a1 >= b1
subcontained(a0, a1, b0, b1) = subinterval(a0, a1, b0, b1) || subinterval(b0, b1, a0, a1)
overlap(a0, a1, b0, b1) = a0 <= b1 && b0 <= a1
data = open("input") do f
map(l-> parse.(Int, l), eachsplit.(eachsplit(read(f,String)), r"[,-]"))
end
@testset "solutions" begin
@test map(l-> subcontained(l...) ,data) |>sum == 515
@test map(l-> overlap(l...) ,data) |>sum == 883
end
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