summon : dimiss :: gather : disperse
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Diamond is the hardest mineral at Mohs hardness 10, ten being the hardest. There is no natural mineral substitute for processes requiring diamond. Diamond is four times as hard as corundum, the mineral constituting rubies and sapphires. Although diamond is the hardest naturally occurring mineral, it is easily fractured, a characteristic which allowed early jewellery makers to facet this crystal.
10-20 = -10
There are at least two possibilities for this analogy: The second term is half the first, or the second term is the first term minus 10. The first possibility results in 6:3 and second in 6:-4.