$this->chn['O']=24;
$this->chn['P']=25;
$this->chn['Q']=26;
$this->chn['R']=27;
$this->chn['S']=28;
$this->chn['T']=29;
$this->chn['U']=30;
$this->chn['V']=31;
$this->chn['W']=32;
$this->chn['X']=33;
$this->chn['Y']=34;
$this->chn['Z']=35;
$this->cn[0]='0';
$this->cn[1]='1';
$this->cn[2]='2';
$this->cn[3]='3';
$this->cn[4]='4';
$this->cn[5]='5';
$this->cn[6]='6';
$this->cn[7]='7';
$this->cn[8]='8';
$this->cn[9]='9';
$this->cn[10]='A';
$this->cn[11]='B';
$this->cn[12]='C';
$this->cn[13]='D';
$this->cn[14]='E';
$this->cn[15]='F';
$this->cn[16]='G';
$this->cn[17]='H';
$this->cn[18]='I';
$this->cn[19]='J';
$this->cn[20]='K';
$this->cn[21]='L';
$this->cn[22]='M';
$this->cn[23]='N';
$this->cn[24]='O';
$this->cn[25]='P';
$this->cn[26]='Q';
$this->cn[27]='R';
$this->cn[28]='S';
$this->cn[29]='T';
$this->cn[30]='U';
$this->cn[31]='V';