Write a Python function that does the following:

Its name is all$\_$mappings

It takes a single dictionary as an argument, which maps strings to lists of integers

It returns a list of $2-$value tuples, where the first value of the tuples is a key from D$,$ and the second value is an element from its associated list value

Test cases:

print$($ all$\_$mappings$(\{"$a$"$: $[7,3,1]\}))$ # $[("$a$",7),("$a$",3),("$a$",1)]$ print$($ all$\_$mappings$(\{"$a$"$: $[8],"$b$"$: $[2]\}))$ # $[("$a$",8),("$b$",2)]$ print$($ all$\_$mappings$(\{"$a$"$: $[],"$b$"$: $[2]\}))$ # $[("$b$",2)]$ print$($ all$\_$mappings$(\{\}))$ # $[]$

Name the program mappings.py$.$ Make sure that gradescope gives you the points for passing the test case.