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    0:  /at/||/bt/||/ct/||/dt/||/et/||/ft/||/ght/
    1:  /at|bt|ct|dt|et|ft|ght/
    2:  /[abcdef]t|ght/
    3:  /(?:[abcdef]|gh)t/
    4:  /(?:a|b|c|d|e|f|gt)t/