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+-- Overview of layers
+0-9: infrastructure independent of this program
+10-29: level 1, the SubX subset of the 32-bit x86 ISA
+30-39: level 2, moving past counting bytes with operands and labels
+
+See layer 29 for the description of 'level'.
+
+--- Overview of tracing depths
+0: errors
+1-98: app level traces for different SubX programs
+99: low-level details of the VM