mkdir hello
chdir hello
mkdir t1
mkdir t2
mkdir t3
mkdir t4
tree
echo "hello" > t1/1.txt
mkdir t2/t1
mimic t1/1.txt t2/t1
tree
mkdir t4/t1
mimic t1/1.txt t4/t1/
tree
morph -r t4/t1 t3
tree
cat t3/t1/1.txt