In signal processing, the preimage ("before the fold"/recto) function of a loopstring➿ configuration, :== the sequence of pencils✏️ (ie. set of intermediate states - to include SMALL branes and yesegalo) that are framed prior to the determination of an object's image. The preimage is the inverse of an image. (see random coil)
/// The preimage range is comparable to a denatured protein. Likewise, its domain could be that of subchem.