The 6 possible steps are:
Dark: Elucidation, Interpretation, Modification
Light: Transmogrification, Origination, Replication
And the conditions are:
No light immediately before or after light. No dark immediately before or after dark.
Replication and Interpretation are always used. Replication always precedes Interpretation
Transmogrification is always before Elucidation.
Since the imbubing must start with Origination (light), the next step must be dark. It can't be Interpretation since it comes after Replication and it can't be Elucidation since that comes after Transmogrification.
Step 2 is therefore Modification (dark). Replication (light) and Interpretation (dark) are always used so they must be steps 3 and 4 leaving only one light step: Transmogrification.