Retro Problems from Issue 20
377 - Leonid N. Borodatow Quartz 19, Jan-Mar 2002
8+9. Retract 37 moves, then #1 (Proca retractor)
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378 - Paul Raican Quartz 19, Jan-Mar 2002
2+2. Ergänze wK, wT, wS, wB, sK zu einem IC 2 Lösungen
