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E19 | The Perfect Ten Problem; The Long Line Problem
E17 | The Arch Villain Problem; The Straight and Narrow Problem
E16 | Yet Another Tree Problem; The Romeo and Juliet Problem
E15 | The Mega Mall Problem; The Cleopatra Problem
E14 | The Blockette Problem; The Tulip Problem
E11 | The Slop Problem; The Birthday Present Problem
E5 | The Tree Problem; Another Tree Problem