Fold a thin iron wire with a length of 25 cm into a triangle whose side lengths are all prime numbers (unit: cm). If the lengths of the three sides of such a triangle are a, b, and c respectively, and satisfy a≤b≤c, then a, How many groups of values of b and c are there?
将长度为25厘米的细铁丝折成边长都是质数(单位：厘米)的三角形，若这样的三角形的三边长分别是a、b、c，且满足a≤b≤c，则a、b、c的取值有多少组．
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