The Stepwise Palace - a FSVO sequence
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Figure E13 YIELD

Through a rude tunnel, north once more we fare
Into a chamber perilous indeed:
Here, deep in Afric stone, a crystal rare,
The yellow francevillite, sees water bleed
And moderate the neutrons’ fatal seed
To start a chain-reaction underground
Two billion years before mankind will breed.
The hills of OKLO ferment without sound
Or outward sign, a grim Prometheus yet bound.