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In how many ways can two different intervals be combined?
What combinations are possible?
They are listed below:
(1, 2)
m2, M2
(1, 3)
m2, m3
(1, 4)
m2, M3
(1, 5)
m2, P4
(1, 6)
m2, A4
(2, 3)
M2, m3
(2, 4)
M2, M3
(2, 5)
M2, P4
(2, 6)
M2, A4
(3, 4)
m3, M3
(3, 5)
m3, P4
(3, 6)
m3, A4
(4, 5)
M3, P4
(4, 6)
M3, A4
(5, 6)
P4, A4
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