gcc -pipe -c example0112.c
gcc -pipe -c example0111.c
gcc -pipe -c example019.c
gcc -pipe -c example015.c
gcc -pipe -c example014.c
gcc -pipe -c example013.c
gcc -pipe -c example011.c
gcc -pipe -o xx example011.o example012.o example013.o example014.o example015.o example016.o example017.o example018.o example019.o example0110.o example0111.o example0112.o 
strip xx