Names Variable : variable name stored later with reference $ {Variable names}
Path Expressions JSON : through debugging json path expression
Numbers Match : matching digits (0 represents a random, 1 for the first, -1 for all)
Values the Default : The default value can not be found, usually set to NOT FOUND
Var concatenation Compute (suffix_ALL) : whether to count all upcoming matches to save all values, called "variable name _ALL"
***** variable name _N take the first N values