In general , each particular name is valid only within some possibly discontiguous portion of program text called its scope 通常情况下，每个特定的名字仅在程序中某些被称为该名字的作用域的不连续区域中有效。
2.
( 2 ) a fragment combining algorithm is designed to judge the combined ability of the parameterized duplication code fragment which are found by the former method , so the discontiguous parameterized duplication code is detected . the analysis indicates that the new algorithm has an acceptable complexity 经过改进，算法的空间复杂性得到降低，使之更适于大型程序文本的匹配； ( 2 )提出了程序碎片合并算法，判断通过参数化匹配算法找到的重复代码段之间的可合并性，从而能从程序中识别出非连续的近似重复代码。
