Assertion: piton | /r/HasProperty | left by first ascensionists
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Source sentences:
text: In the next few months he made the second ascents of Angelo Dibona's routes on the Croz dell'Altissimo and the Northwest Ridge of the Grossen Ödstein, making a point of not using any of the pitons left by the first ascensionists, thereby putting into practice his desire to climb as his predecessors Georg Winkler and Emil Zsigmondy had: in a pure style, meaning without any artificial aids (without guides in Zsigmondy's case and solo, in Winkler's).