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Ok... 10mm will be medium high power and the shortest you could ever use will be 7mm - a 4mm will be utterly useless.
Another possibility is to buy a 1.4X Barlow instead of more eyepieces - using this with your two eyepieces will give the equivalent of 14 and 7mm.
IMHO you only need 3 eyepieces - lowest power, medium and high power. More are a waste of money. The problem is the two you have make it awkward to choose a 3rd from what's available at Andrews.
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