simple use of xargs to streamline a series of mkdir ops

mkdir repeatedly.sh

mkdir playground
mkdir playground/src
mkdir playground/classes

echo playground playground/src playground/classes | xargs mkdir
# mkdir: cannot create directory `playground': File exists
# mkdir: cannot create directory `playground/src': File exists
# mkdir: cannot create directory `playground/classes': File exists

# Bonus points for DRYing the "playground" part...?