convertCubeStr = function (cubeStr) {
    let defstr_enum = {'U1':0, 'U2':1, 'U3':2, 'U4':3, 'U5':4, 'U6':5, 'U7':6, 'U8':7, 'U9':8,
                    'R1':9, 'R2':10, 'R3':11, 'R4':12, 'R5':13, 'R6':14, 'R7':15, 'R8':16, 'R9':17,
                    'F1':18, 'F2':19, 'F3':20, 'F4':21, 'F5':22, 'F6':23, 'F7':24, 'F8':25, 'F9':26,
                    'D1':27, 'D2':28, 'D3':29, 'D4':30, 'D5':31, 'D6':32, 'D7':33, 'D8':34, 'D9':35,
                    'L1':36, 'L2':37, 'L3':38, 'L4':39, 'L5':40, 'L6':41, 'L7':42, 'L8':43, 'L9':44,
                    'B1':45, 'B2':46, 'B3':47, 'B4':48, 'B5':49, 'B6':50, 'B7':51, 'B8':52, 'B9':53 };
    let mapping = "L7D7B9L8D4L9D1F7L4B6L5L6F4L1U1B3L2U4L3U7F1D8B8D5D2F8B5F5U2B2U5U8F2R9D9B7R8D6R7D3F9R6B4R5R4F6R3U3B1R2U6R1U9F3";
    let defStr = Array(54);
    for (let i = 0; i <= 53; i += 2) {
        defStr[defstr_enum[mapping.substr(i, 2)]] = int(i / 2);
    }
}