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<form> <input type="tel" required pattern="^\s*(?:\+?(\d{1,3}))?[-. (]*(\d{3})[-. )]*(\d{3})[-. ]*(\d{4})(?: *x(\d+))?\s*$" oninvalid="this.setCustomValidity(' ')" oninput="this.setCustomValidity('')"/> </form>

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