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The self denominated Pact for Unity (Pacto por la Unidad), which includes several indigenous organizations have put forward their proposal for a constitution. On May 23, these organizations met in Sucre where they debated and came up with the text.
The text is in Spanish and 65 pages long, so I won't even try to translate. :-) However, those who are interested can take a look at it here.
My first impression, it is evident that it comes from the indigenous organizations. It has a very strong ethnic component. It should be a good basis for drawing up the one which will include everyone.