Sentence:  Hans Schweizer had one that increased from 19 - 1 2 inches to 5 feet 3 inches in five years , and J . J . Quelch records a growth of from less than 4 feet to nearly 10 in about <WSD>six</WSD> years . 
Meaning of the word marked with <WSD> tags:  denoting a quantity consisting of six items or units