= Nonadjacent dependency learning
{title2=$aXb$}
<Learning> a relation between elements separated by intervening material. In an artificial $aXb$ system, increasing variability in $X$ can help expose the stable $a$–$b$ relation. Such a relation need not be hierarchical <syntax>.<Variability and detection of invariant structure by Rebecca L. Gómez>[Psychological Science 13, 431–436; three-element artificial-language strings, middle-element variability and nonadjacent dependencies]{ref}
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