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In page Haidbauer incident:

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He spent hours with favoured pupils, offering them extra tuition outside the classroom, sometimes until eight in the evening, which did not endear him to their parents.[5] He would take them on overnight trips to Vienna to see museums and cathedrals; after one such trip the group had to hike at night through a forest for 12 miles from the station at Gloggnitz, back up the mountain to Trattenbach.[6]