Filter Out The Slice Starting Points Matched By Rules.

As a professional code auditor with expertise in CWE476.

Based on the provided code information (including {file_name}, {function_name}, {function_line_range}, {function_source_code}), determine whether the given a list of {key_variables} consist of a tuple which first element is line number and second element is variable name in the code snippet that are prone to causing null pointer dereference. Output a list of probability values according each tuple ranging from 0 to 1.