If you set the multiplicity for an association, set it on the From end and To end tabs of the properties window. In multiplicity, type the desired value(s) for the multiplicity.For an attribute or operation, the window is opened directly after clicking the element. In the diagram, click the element, and then click to open the properties window.Setting the multiplicity via the properties pop-up window Removing the values will reset the multiplicity to the default of 1. Entering a single value implies the lower and upper value are the same (except for entering a single *). It is represented by a line between the classes. If you add two values, make sure you leave the two dots in between. It depicts the relationship between objects, such as a teacher, can be associated with multiple teachers. Do the same for the other side, if needed.
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