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In what order are variables initialized?

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Let's start with a job that has these parameters:

A = "A_Value AND ${B_Value}"
B = "B_Value"

In java, this would be something like:

String a = "A_Value AND " + b;
String b = "B_Value"

This is not legal. In kettle, it seems to work. But is it guaranteed to always work? And why?

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