An alternative or nonstandard plural of duplex (the correct plural being duplexes).
Formed by adding the regular plural suffix -s to duplex, though the standard plural is duplexes. This represents a common overgeneralization of English plural rules.
English plurals are tricky—words ending in -x usually add -es, but people often just add -s, creating 'duplexs' even though 'duplexes' is correct.
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