return {
  parts = {
    [0] = {{"self",{01,00,00,00}}, {"self",{00,00,00,00}}}
  },
  chunks = {
    [0] = {
      terrain = {
        {00,00,00,00,00,00,00,00},
        {00,00,00,00,00,00,00,00},
        {00,00,00,00,00,00,00,00},
        {00,00,00,00,00,00,00,00},
        {00,00,00,00,00,00,00,00}
      },
      objects = {
        {00,00,00,00,00,00,00,00},
        {00,00,00,00,00,00,00,00},
        {00,00,00,00,00,00,00,00},
        {00,00,00,00,00,00,00,00},
        {00,00,00,00,00,00,00,00}
      },
      grind = {
        {00,00,00,00,00,00,00,00},
        {00,00,00,00,00,00,00,00},
        {00,00,00,00,00,00,00,00},
        {00,00,00,00,00,00,00,00},
        {00,00,00,00,00,00,00,00}
      }
    },
    [1] = {
      terrain = {
        {00,00,01,00,00,00,04,03},
        {00,00,00,01,00,00,00,03},
        {00,00,02,02,02,02,02,03},
        {00,00,00,01,00,00,00,03},
        {00,00,01,00,00,00,04,03}
      },
      objects = {
        {00,00,00,01,01,01,00,00},
        {00,00,00,00,00,00,00,00},
        {00,00,00,00,00,00,00,00},
        {00,00,00,00,00,00,00,00},
        {00,00,00,02,02,02,00,00}
      },
      grind = {
        {00,00,00,00,00,00,00,00},
        {00,00,00,00,00,00,01,03},
        {00,00,01,02,02,02,03,00},
        {00,00,00,00,00,00,00,00},
        {00,00,00,00,00,00,00,00}
      }
    },
  }
}