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I have two lists:

list1 = {{{x1,x2},{x3,x4}}, {{x5,x6},{x7,x8}}};
list2 = {{{x9,x10},{x11,x12}}, {{x13,x14},{x15,x16}}}

I need to join them to get one list:

 {{{x1,x2},{x3,x4},{x9,x10},{x11,x12}}, {{x5,x6},{x7,x8},{x13,x14},{x15,x16}}}

There is a Join[] function that seem like a good choice to solve this problem but I can't apply it in a right way to get the appropriate result. What can I do?

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You can use Join with level specification 2:

Join[list1, list2, 2]

{{{x1, x2}, {x3, x4}, {x9, x10}, {x11, x12}}, {{x5, x6}, {x7, x8}, {x13, x14}, {x15, x16}}}

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MapThread[Join, {list1, list2}]

{{{x1, x2}, {x3, x4}, {x9, x10}, {x11, x12}}, {{x5, x6}, {x7, x8}, {x13, x14}, {x15, x16}}}

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  • $\begingroup$ I think this works in older versions of Mathematica (pre V10) $\endgroup$ – mikado Dec 8 '19 at 15:00
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Flatten[{list1, list2}, {2, 1, 3}]

{{x1, x2}, {x3, x4}, {x9, x10}, {x11, x12}, {x5, x6}, {x7, x8}, {x13, x14}, {x15, x16}}

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