if I had known+◼◼◼[UK: ɪf ˈaɪ həd nəʊn] [US: ˈɪf ˈaɪ həd ˈnoʊn]
had I known+◼◼◼[UK: həd ˈaɪ nəʊn] [US: həd ˈaɪ ˈnoʊn]
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