a. pencils to notebooks
b. notebooks to pencils
c. pencils to total numbers of things
d. notebooks to total number of things
![A Pencils To Notebooksb Notebooks To Pencilsc Pencils To Total Numbers Of Thingsd Notebooks To Total Number Of Things class=](https://ph-static.z-dn.net/files/d52/0fe538edc958a2b872bb3e39d254f611.jpg)