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This PR adds a component that can derive assignments and other code on identities and multiple rows. It keeps track of which cells in the trace are already known and which not. The way to access fixed rows is abstracted because it does not have a concept of an absolute row. While this might work for block machines with cyclic fixed columns, it does not work in the general case. What it does not do: - have a sequence of which identities to consider on which rows - a mechanism that determines when it is finished --------- Co-authored-by: Georg Wiese <georgwiese@gmail.com>