┃1/2007-1/2006┃+┃1/2006-1/2005┃+┃1/2005-1/2004┃-┃1/2004-1/20
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|1/2007-1/2006|+|1/2006-1/2005|+|1/2005-1/2004|-|1/2004-1/2007|

=[-(1/2007-1/2006)]+ [-(1/2006-1/2005)]+ [-(1/2005-1/2004)]-(1/2004-1/2007)

=-1/200+1/2006-1/2006+1/2005-1/2005+1/2004-1/2004+1/2007

=0

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