def strings = ['Mary', 'had', 'a', 'little', 'lamb', ". It's", 'fleece', 'was', 'white', 'as', 'snow']

println strings

strings[0] = 'Arthur'
strings[4] = 'towel'
strings[6] = 'stain'
strings[8] = 'ripe'
strings[10] = 'strawberries'

println strings