Mutation followed by association
A mutation changes an identifiable part of the material. An association changes the direction of attention. Keeping those events separate helps a reader follow a difficult score. A one-letter substitution can be checked character by character; the claim that a new word evokes a social or emotional world needs a different kind of explanation. The source uses binding and unbinding beside fusion, absence and propagation. A bound letter retains its ordinary written or spoken function while acquiring a local role through its host. The source attributes the Orthographic Operators method to Igor V. Satanovsky. The role follows the particular binding; it is not a permanent dictionary meaning attached to that letter everywhere. Here grain loses its first letter and leaves rain. The literal operation makes the initial agricultural material available to another weather system. Roof and tenancy arrive by association. Returning to grain as a tenant changes its situation. The final state preserves an audible and material connection to the beginning while refusing a simple reset.

Found in the Barn
grain ÷ g → rain
rain ↝ roof ↝ tenancy
One sack in the attic
pays its rent in shoots.

Making and checking the poem
Use one operation per line: kind | from | to | explanation. For bind and unbind the final field is the literal radical. Replace checks exactly one substituted character; fuse joins parts separated by +; delete records an endpoint ∅. Associate, branch and return retain the poet’s interpretation. The source poem remains unchanged.
A literal mismatch is useful evidence, not a reason to erase the poem. Revise the rule or describe the operation as figurative. ∅ can mean deletion, absence or a zero-state; define which.