I have an old version of jQuery showing up. How do I figure out where it is coming from?

        Is line 39 located in the `<header></header>`?
                        /       \
                      Yes       No
                      /           \
                  Remove it     Check `functions.php` 
                                look for `enqueue_script()`.
                                Found it?
                                /       \
                              Yes       No
                             /            \
                        Remove it       Disable All Plugins.
                                        Is it gone?
                                        /     \
                                      Yes     No
                                      /         \
                                  Remove it     Re-search all
                                                Template Files.
                                                Found it?
                                                /       \
                                              Yes       No
                                              /           \
                                          Remove it      You're SoL

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