These cancel out. Q sub zx and Q sub xz, these two also cancel out.

这些也相互抵消了，Qzx和Qxz也抵消了。

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This is not to say "xz" is impossible, only that a crossword generated with it will not score highly.

这并不是说“xz”不可能出现，而只是说使用它生成的 纵横字谜没有多高的价值。

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Dong XZ, Cai MY. Identification system manual of common bacteria[M]. Beijing: Science Press, 2001: 348 -392.

（in Chinese） 东秀珠， 蔡妙英。 常见细菌系统鉴定手册[M]。 北京： 科学出版社， 2001，： 348 -392。

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The Olympus XZ-2 is also designed to make sharing your amazing images even easier.

ENGADGET: Olympus Stylus XZ-2 is a digital compact stuck in a mirrorless camera's body, we go hands-on

When compared to the XZ-2, the XZ-10 is slimmer with a 40% smaller volume.

ENGADGET: Olympus unveils Stylus XZ-10 with f/1.8-2.7 zoom, smartphone sharing app

The XZ-2 also features 11 Art Filters and 5 Art Effects that easily bring artistic visions to life.

ENGADGET: Olympus Stylus XZ-2 is a digital compact stuck in a mirrorless camera's body, we go hands-on