“Occlude” rhymes with “Conclude”. You close up an event by concluding it. Remember thus!
Think about an ambulance that takes you for a minor surgery and brings you back the same day.
Immutable should remind of shape- or form-shifting mutants who should remind you of “change”. Immutable, thus, is anything which does not change.
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Try not to be one!
Now, now, don’t be so crotchety!