Thankyou very much,
For clarifying this misunderstanding.
I knew it had to be something simple,so
the L&M stand for;
"L"cd "M"ask,maybe they would of been better
off useing "S"creen "M"ask instead or better
off,like you said a mention in the manual.
Have yourself a Merry Christmas,again,thanks
for replying/claring this up so quickly.