WORLD’S SMALLEST, HARDEST CROSSWORD

ACROSS 1. Benevolent creature (Scand folklore) (3) 4. Skeleton part (4) 5. Learning method (4) 6. Tropical bird (3) DOWN 1. Day divider (4) 2. A former unit of currency in Peru (4) 3. Understand (3) 4. Lingerie item (3)