These words pairs fall into one of two categories. Either a letter is removed from the first word; the remaining letters are rearranged to make the second word Or a letter is removed from the second word; the remaining letters are rearranged to make the first word. The two words together make a phrase.
"Subtracting and Mixing,"
Word Ways: Vol. 49
, Article 26.
Available at: http://digitalcommons.butler.edu/wordways/vol49/iss2/26