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E1 July - August 1914
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E2 September - October 1914
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E3 October - December 1914
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E4 December 1914 - June 1915
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E5 June - September 1915
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E6 December 1915 - October 1916
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E7 October 1916 - April 1917
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E8 April 1917 - November 1917
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E9 December 1917 - June 1918
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E10 July - September 1918