{
  "$SAND": { /* sand -> crude glass */
    "difficulty": 1.0,
    "product": [1, "basegame:148"]
  },
  "item@basegame:144": { /* quartz -> clean glass */
    "difficulty": 1.0,
    "product": [1, "basegame:149"]
  },

  "$LOGS": { /* logs -> charcoal */
    "difficulty": 1.0,
    "product": [1, "item@basegame:29"]
  },

  "item@basegame:128": { /* copper ore -> ingot */
    "difficulty": 1.0,
    "product": [1, "item@basegame:112"]
  },
  "item@basegame:129": { /* iron ore -> ingot */
    "difficulty": 1.0,
    "product": [1, "item@basegame:113"]
  },
  "item@basegame:130": { /* coal -> coke */
    "difficulty": 1.0,
    "product": [1, "item@basegame:114"]
  },
  "item@basegame:131": { /* zinc ore -> ingot */
    "difficulty": 1.0,
    "product": [1, "item@basegame:115"]
  },
  "item@basegame:132": { /* tin ore -> ingot */
    "difficulty": 1.0,
    "product": [1, "item@basegame:116"]
  },
  "item@basegame:133": { /* gold ore -> ingot */
    "difficulty": 1.0,
    "product": [1, "item@basegame:117"]
  },
  "item@basegame:134": { /* silver ore -> ingot */
    "difficulty": 1.0,
    "product": [1, "item@basegame:118"]
  },
  "item@basegame:135": { /* lead ore -> ingot */
    "difficulty": 1.0,
    "product": [1, "item@basegame:119"]
  },
  "item@basegame:25": { /* clay ball -> a brick */
    "difficulty": 1.0,
    "product": [1, "item@basegame:56"]
  }
}