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iloinstructions00-05
+----+----+--------+-------------------------------------------+
| Op | Nm | Stack | Description |
+====+====+========+===========================================+
| 00 | .. | - | non-op |
| 01 | li | -n | push value in following cell to stack |
| 02 | du | n-nn | duplicate top stack item |
| 03 | dr | n- | discard top stack item |
| 04 | sw | ab-ba | swap top two stack items |
| 05 | pu | n- | move top stack item to address stack |
+----+----+--------+-------------------------------------------+
More at *iloDetailedInstructions