MAIN START LAD GR1,A LD GR0,0,GR1 LD GR2,2,GR1 LD GR3,3,GR1 LD GR4,4,GR1 LD GR5,5,GR1 LD GR6,6,GR1 LD GR7,7,GR1 LD GR1,1,GR1 RET A DC 2,3,5,7,11,13,17,19 END