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blackboard [blackboards]▼◼◼◼noun[UK: ˈblæk.bɔːd] [US: ˈblæk.ˌbɔːrd]
blackboards▼◼◼◼noun[UK: ˈblæk.bɔːdz] [US: ˈblæk.ˌbɔːrdz]
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