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let v1 = a?.b
let v2 = a?.[b]
let v3 = a?.(b)
let v4 = a()?.b
let v5 = a()?.[b]
let v6 = a()?.(b)
let v1 = a?.b
let v2 = a?.[b]
let v3 = a?.(b)
let v4 = a()?.b
let v5 = a()?.[b]
let v6 = a()?.(b)