var sample=[['F','L','F','Di','F','R2','Ui','Ri','D','R2','Bi','D','R2','U2','L','Bi','Li','U','Fi','Di','Li','Fi','U','Bi','R','U'],['F','R2','Di','Li','B'],['R2','D2','B2','Di','R','U2','L'],['R2','Ui','F2','D2','L2','D','F2','Di'],['F2','U2','B2','D2','R2','F2','L2','U2']];