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day 96 total contributed money is 1m which can be available if know last day contribution

Can you explain? Why 1m? Why not 5m or .5m? Unless you look at the actual contract details, you can't see how much has been contributed to each individual ICO window.

Each window is separate. The amount contributed to a previous has nothing to do with the next window.

If, for example, someone drops a lot of ETH into day 5 (way more than they should have, causing the price per EOS to be above average on that day), then knowing that is a huge advantage and you can wait until day 6 to get a better price. Make sense?