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6a, S?o???, Ending in his text suggests weapons.
8d, ??u???u?, Fearful - looking creature ruins a do, unfortunately.
12a, E?p???, Out former model.
10a, C?n?t???, Stable studies article probing series of races.

12 ex pose
8d dinosaur
6a swords
10a constant

Thanks, sudokulover, now completed it.