Constant MARK 

const MARK: &str = "<svg xmlns=\"http://www.w3.org/2000/svg\" width=\"1024\" height=\"1024\" viewBox=\"0 0 1024 1024\" role=\"img\" aria-label=\"planarian\" ><title>planarian</title><path d=\"M458.776,911.524 C457.200,911.345 451.304,910.803 445.675,910.320 C419.736,908.093 386.155,901.180 362.972,893.295 C312.484,876.122 267.447,847.525 230.284,809.043 C160.043,736.309 128.054,642.544 137.044,535.746 C143.900,454.288 178.137,382.086 238.556,321.668 C263.330,296.894 290.614,275.271 332.663,247.089 C356.639,231.020 363.849,223.801 367.953,211.757 C369.526,207.139 369.665,205.461 369.229,196.340 C368.876,188.950 369.066,184.563 369.911,180.561 C372.588,167.889 381.316,157.295 394.330,150.923 C408.129,144.166 420.243,141.581 448.131,139.441 C493.078,135.993 512.552,132.692 549.666,122.233 C585.695,112.080 602.535,110.005 619.866,113.581 C629.686,115.608 635.440,118.310 640.867,123.442 C647.125,129.361 649.777,135.541 650.224,145.249 C650.861,159.062 646.746,170.162 631.842,194.836 C588.258,266.992 585.000,272.521 570.160,299.513 C555.870,325.504 552.961,330.573 548.546,337.179 C537.806,353.247 526.897,360.187 512.287,360.244 C503.455,360.279 498.288,358.678 485.388,351.911 C479.533,348.840 471.552,345.212 467.653,343.849 C445.387,336.069 414.996,340.074 384.403,354.819 C331.278,380.424 294.093,432.467 286.720,491.529 C285.306,502.859 285.533,528.453 287.168,541.887 C292.226,583.469 310.611,626.295 337.955,660.196 C359.644,687.086 389.066,710.542 420.660,726.131 C440.949,736.143 453.336,740.551 474.539,745.305 C493.992,749.667 500.619,750.281 527.967,750.259 C555.408,750.237 562.601,749.480 583.238,744.437 C644.199,729.542 702.244,688.129 738.594,633.597 C762.791,597.295 777.011,560.114 783.579,515.972 C785.399,503.746 785.664,463.472 784.013,450.178 C780.340,420.603 771.840,391.937 758.883,365.429 C740.834,328.503 713.891,294.612 675.357,260.362 C657.674,244.645 656.115,243.002 656.115,240.098 C656.115,233.001 664.654,232.982 685.768,240.032 C735.990,256.802 780.812,290.305 816.404,337.679 C849.029,381.105 876.080,442.390 884.516,491.986 C890.120,524.937 889.993,561.233 884.150,596.749 C877.092,639.645 859.184,684.706 832.742,726.102 C796.220,783.281 741.738,831.785 677.209,864.571 C666.530,869.996 663.012,871.601 644.651,879.419 C620.006,889.914 582.690,900.645 552.723,905.855 C529.161,909.952 514.046,911.266 487.026,911.567 C473.064,911.723 460.352,911.703 458.776,911.524 Z M517.782,223.096 C525.749,219.378 533.677,211.084 536.004,204.035 C538.757,195.693 537.275,181.690 532.946,175.149 C520.007,155.597 489.481,157.319 477.189,178.294 C461.217,205.547 489.202,236.433 517.782,223.096 Z M551.715,282.230 C563.082,276.043 569.118,265.906 569.118,253.003 C569.118,236.195 559.014,224.954 542.987,223.934 C517.300,222.298 499.462,247.493 510.168,270.288 C515.460,281.554 522.489,285.686 536.510,285.772 C543.331,285.814 546.475,285.082 551.715,282.230 Z\" fill=\"currentColor\" fill-rule=\"evenodd\"/></svg>\n";