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<tt>Click on the click the variable "Place" (Figure 8). It will be highlighted
with green underline, all other related (with same sort) variables will
also be highlighted but with red underline. Right click on the green underlined
variable to rename "Place" to "A". Right click on the red underlined variable
will allow user to specify the relationship between the current red underlined
variable and the green underlined variable (Figure 9). Choose option "Different",
then type "B" in the popped input box. T