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http://studwww.ira.uni-karlsruhe.de/~s_soysal/psychic2.swfThe same symbol is used for all multiples of 9.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)