Revert "initial commit"

This reverts commit 5940bcc02c7692c1ff41ae557170636377c424f3.
Revert "add dada txt file"

This reverts commit 2fdce19f1010953d432c18e67f953104b17e02e0.
Revert "add !"

This reverts commit 3e8e7b0d4296c90921483a7384dae0a6e463fd39.