Take any two numbers from 3, 4, 5, 10, 12, 26 each time, one as the numerator and one as the denominator, many different fractions can be formed, how many of them are the simplest true fractions?
每次从3、4、5、10、12、26中任取两个数，一个作分子，一个作分母，可以组成很多不同的分数，其中最简真分数有多少个．
<result>7</result>