english: When Proctor &amp; Gamble went from 26 different kinds of Head &amp; Shoulders to 15, they saw an increase in sales by 10 percent.
non_english: Коли компанія "Proctor &amp; Gamble" залишила 15 видів шампуню "Head &amp; Shoulders" з 26, продажі зросли на 10 відсотків.