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     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    },
    {
     "label": "Gravel, pebbles, cobbles",
     "url": "e3ad5e2810230d585f70d58111431a58",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAHxJREFUOI3F1EEOgDAIBMAa+lfexGMbPZHQAywojXsyaR2oks7RnHkMXCL3F4iYrw3syv8gMY8lkgPRZmKGBTcQYUsEoqkjo85LoNeRVyQEFdMXLe51HIIW0md09NQ3RD/DrqXnMOrMFizNYSbpOXwFduTcYOt9FqElsCsPBFE4I/XIVYgAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    },
    {
     "label": "Pebbles, cobbles",
     "url": "13b1dbb03b0d156ce9b612179cad68df",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAGVJREFUOI3l1MEKwCAMA1BH/dd8Uz9WtlPAnRoxYwdz8iCPpoK9mdM/A0fmvQMFcL1AV/4HA2gj0wMGUN6RQU5WoRJY1VwClZoySIzTbe9whniuqks7VB5jCSRqBdWcDPI/s4GuPKtHIPTR4DMjAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    },
    {
     "label": "Compacted sediments or sedimentary bedrock",
     "url": "584467de04afb7882d9ee6f30f68f507",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAADFJREFUOI1jYaAyYKGZgR1Rrv8pMahi2W5GFAOpBUYNHDVw1MBRA+lsIKw8o5qB1AIAUi8GK4q7YZ4AAAAASUVORK5CYII=",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    }
   ]
  }
 ]
}