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Throughout this section, we shall assume the existence of finitely presented groups with unsolvable word problem.

Miss Padsoe looked very fragile and old, more like a scare-the-birds than a woman as she carefully wrapped a mothy old bit of fur round her thin neck, and Miss Baker wondered if she ought to come out in this bitter cold, and said as much.

Alarm brought Bradly over to glare down at Podson, bristling up his beard at him. Podson glanced at Bradly, and away from him, and rasped his shoulder-blades; manifesting these symptoms of ill-ease over a spiritual quandary.