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knotty [knottier, knottiest]▼(complicated or tricky, see also: complex; difficult)adjective[UK: ˈnɒ.ti] [US: ˈnɑː.ti]
tricky [trickier, trickiest]▼(hard to deal with)adjective[UK: ˈtrɪk.i] [US: ˈtrɪk.i]
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