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| neither knows; no way to tell; there is no way to tell; no one knows; no one can tell | |||
| is anybody's guess; it is anybody's guess | |||
| is anyone's guess (How much this will cost taxpayers is anyone's guess. ART Vancouver) | |||
pretty much anybody's guess (Precisely how the man knew what ‘a witchcraft ceremony' involving decapitated water-fowl might look like, however, is pretty much anybody's guess.  mysteriousuniverse.org ART Vancouver) | |||
| никто не знает: 40 phrases in 9 subjects |
| American usage, not spelling | 2 |
| Cliche / convention | 2 |
| General | 21 |
| Informal | 1 |
| Makarov | 6 |
| Mathematics | 1 |
| Quotes and aphorisms | 3 |
| Rhetoric | 1 |
| Scientific | 3 |