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<option value="nothing">Wechsel
<option value="bst1-1-1.htm">S1-Skater
<option value="bst1-1-2.htm">S2-Skater
<option value="bst1-1-3.htm">S3-Skater
<option value="bst1-1-4.htm">S4-Skater
<option value="bst1-1-5.htm">S5-Skater
<option value="bst1-1-6.htm">S6-Skater
<option value="bst1-1-7.htm">S7-Übungen
<option value="bst1-1-8.htm">S8-Parallelität
<option value="bst1-1-9.htm">S9-Orthogonalitä
<option value="bst1-1-10.htm">S10-Abstand P-Q
<option value="bst1-1-11.htm">S11-Abstand P-g
<option value="bst1-1-12.htm">S12-Übungen
<option value="bst2-1.htm">S13-Tangente Kreis
<option value="bst2-2.htm">S14-Konstruktion
<option value="bst3-1.htm">S15-Dreieck-Quadrat-Stern
<option value="bst4-1-1.htm">S16-Umkreis1
<option value="bst4-1-2.htm">S17-Umkreis2
<option value="bst4-2.htm">S18-Übungen
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