Revert "delete Con line"

This reverts commit dbb20c9eb2254ac5e0fde6c816a7d2bdc6425b58.
Revert "Revert "delete Con line""

This reverts commit 0a81c1fcec112d9c18679bf53ec508858a71e0ef.
Revert "Revert "Revert "delete Con line"""

This reverts commit 16150df3f96ffada621d1643d70b906e184bd23c.