L = { 1 , 2 , 3 , 4 , 5 , 6 , 7 } {\displaystyle {}L=\{1,2,3,4,5,6,7\}} , M = { a , b , c , d , e , f , g , h } {\displaystyle {}M=\{a,b,c,d,e,f,g,h\}} ,