Revert "ex1Curs2"

This reverts commit 45766b36be0f0d066e5103180fe254e98383ff2c.
Revert "Revert "ex1Curs2""

This reverts commit 97d99f2d43d4a2b56d5fda06e6db2c497b0bd5a4.
Revert "ex1Curs2"

This reverts commit 45766b36be0f0d066e5103180fe254e98383ff2c.