add glossary term "program order"

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+# Program Order
+
+See <https://stackoverflow.com/questions/26933991/what-does-actually-program-order-mean>
+
+    the result of any execution is the same as if the operations of
+    all the processors were executed in some sequential order, and the
+    operations of each individual processor appear in this sequence in
+    the order specified by its program.
+