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    1. Nudged Elastic Band: method for finding reaction pathways between two stable states.
    2. Dimer: method for finding reaction pathways when only one state is known.
    3. Lanczos: provides an alternative way to find the lowest mode and find saddle points.
    4. Optimizers: provides an alternative way to find the lowest mode and find saddle points.
    5. Dynamical Matrix: uses finite difference to find normal modes and reaction prefactors.
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