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const stepMachine = Machine(
  {
    id: "steps",
    initial: "step1",
    states: {
      step1: {
        on: {
          NEXT: "step2"
        }
      },
      step2: {
        initial: 'a',
        states: {
          a: {
            on: { NEXT_FIELD: 'b'}
          },
          b: {
            on: { NEXT_FIELD: 'c'}
          },
          c: {},
          hist: { type: 'history' }
        },
        on: {
          NEXT: "step3",
          PREV: "step1"
        }
      },
      step3: {
        on: {
          PREV: "step2.hist"
        }
      }
    },
    on: {
      GOTO_STEP1: "step1",
      GOTO_STEP2: "step2",
      GOTO_STEP3: "step3"
    }
  }
);