According to this passage, what percent of the lithography machine market do Ultratech, Canon and Nikon, MKS Instruments, Lam Research and Cadence Design Systems have in aggregate? 
 If ASML has 67 percent of the worldwide sales of lithography machines and if Ultratech, Canon and Nikon, MKS Instruments, Lam Research and Cadence Design Systems represent their sole competition, than these companies must share the remaining 33 percent of the market.