Parallel Makefile

examples/g: examples/c examples/b examples/a
        echo "g" | tee examples/g
examples/f: examples/d
        echo "f" | tee examples/f
examples/e: examples/b
        echo "e" | tee examples/e
examples/d: examples/c examples/b
        echo "d" | tee examples/d
examples/c: examples/a
        echo "c" | tee examples/c
examples/b examples/a:
        echo "b" | tee examples/b
        echo "a" | tee examples/a