"המעיל קטן, לכן אני קונֶה מעיל חדש."
Translation:The coat is small, therefore I am buying a new coat.
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The word אז more strictly means "at that time". Then it is used also for "subsequently", and then it's used also for "therefore". So it's often used where לכן can be used, but (a) it's less formal (in the sense of cause), and (b) it seems less committed to specifying cause-and-effect.