Revert "Data_validation"

This reverts commit 78c2af3448f590c0ab24948c51f7e4df07abe6b4.
Revert "Revert "Data_validation""

This reverts commit f7870fa274c6019909650a1ad1b1d39579096ef8.
Revert "qr"

This reverts commit d913c5df57330300db1dec79fa62c958d7f61b21.
Revert "Data_validation"

This reverts commit 78c2af3448f590c0ab24948c51f7e4df07abe6b4.
1