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similar-grid(|op: image1>) list-of |images>
Compare the grid defined with respect to the image1 operator,
with all the grids defined with respect to the operators in list-of |images>
The intended use case is to map images to grids of sequences, and then compare them.

-- the simplest possible example:
-- a grid with only 1 element in it:
image1 |0> => |a> . |b> . |c>
image2 |0> => |a> . |> . |c>
image3 |0> => |> . |b> . |>

-- now compare them:
similar-grid(|op: image1>) (|op: image1> + |op: image2> + |op: image3>)
    |image1> + 0.666667|image2> + 0.333333|image3>

-- now compare image2 to the others:
similar-grid(|op: image2>) (|op: image1> + |op: image2> + |op: image3>)
    |image2> + 0.666667|image1>

-- now compare image3 to the others:
similar-grid(|op: image3>) (|op: image1> + |op: image2> + |op: image3>)
    |image3> + 0.333333|image1>