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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const fetchMachine = Machine({
  id: 'documents-and-additional-questions',
  initial: 'provide-documents',
  entry: ['assignRootEntity', 'assignCurrentEntitiesFlat'],
  states: {
    'provide-documents': {
      entry: ['clearCurrentEntityCards'],
      on: {
        NEXT: [
          {
            target: 'answer-questions',
            cond: 'currentEntityNeedsAnswerQuestions'
          },
          {
            target: 'provide-documents',
            actions: ['assignNextEntity'],
            cond: 'nextEntityNeedsProvideDocuments'
          },
          {
            target: 'success'
          }
        ],
        BACK: [
          {
            target: 'answer-questions',
            actions: ['assignPreviousEntity'],
            cond: 'previousEntityNeedsAnswerQuestions'
          },
          {
            target: 'provide-documents',
            actions: ['assignPreviousEntity'],
            cond: 'previousEntityNeedsProvideDocuments'
          },
          {
            target: 'answer-questions',
            actions: ['assignPreviousEntityThatNeedsAnswerQuestions'],
            cond: 'hasSomePreviousEntityToAnswerQuestions'
          },
          {
            target: 'provide-documents',
            actions: ['assignPreviousEntityThatNeedsProvideDocuments'],
            cond: 'hasSomePreviousEntityToProvideDocument'
          }
        ]
      }
    },
    'answer-questions': {
      entry: ['clearCurrentEntityCards'],
      on: {
        NEXT: [
          {
            target: 'provide-documents',
            actions: ['assignNextEntity'],
            cond: 'nextEntityNeedsProvideDocuments'
          },
          {
            target: 'answer-questions',
            actions: ['assignNextEntity'],
            cond: 'nextEntityNeedsAnswerQuestions'
          },
          {
            target: 'success'
          }
        ],
        BACK: 'provide-documents'
      }
    },
    exit: {
      type: 'final',
      entry: ['BACK']
    },
    success: {
      type: 'final',
      entry: ['NEXT']
    }
  }
});