How to iterate inside the values ?

[tnechaev]

I have json file with the following structure: {"123456": [[1, 4], [66, 75]], "224935": [[3, 129],[153,162],[184,197]]}, where values define intervals of numbers ( [1,4] stands for 1,2,3,4 and so one). What I need is to obtain pairs key--number from each interval in the corresponding value (to compare these pairs with some other pairs of numbers). It seems for this I should iterate not only through keys, but inside the values somehow. How can I do so?

Thanks in advance!