1 2{sub(/[aeiou]/, "foo"); print} 3{sub("[aeiou]", "foo"); print} 4 5{gsub(/[aeiou]/, "foo"); print} 6{gsub("[aeiou]", "foo"); print} 7 8{sub(/[aeiou]/, "&foo"); print} 9{sub("[aeiou]", "&foo"); print} 10 11{gsub(/[aeiou]/, "&foo"); print} 12{gsub("[aeiou]", "&foo"); print} 13 14{sub(/[aeiou]/, "\&foo"); print} 15{sub("[aeiou]", "\&foo"); print} 16 17{gsub(/[aeiou]/, "\&foo"); print} 18{gsub("[aeiou]", "\&foo"); print} 19