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A couple in their early thirties have had three consecutive first-trimester miscarriages and have no living children. Both are well and neither has a family history of intellectual disability or congenital malformation. Her uterine cavity is normal on ultrasound, and thyroid and antiphospholipid screens are unremarkable. A colleague has requested a chromosomal microarray on blood from both partners. Which one of the following abnormalities, if one of them carried it, would this test fail to detect?
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