There is also a special character which indicates
the end of the line. It is '$'. So that
changes 'ab' to 'xy' only if 'ab' ended the line.
In the file 'text' there are some lines which end
in 'cup'. Change them to end in 'saucer'. Again,
it only takes one command.
Then rewrite the file and type 'ready'.
3 teaspoons = 1 tablespoon
16 tablespoons = 1 saucer
3 teaspoons = 1 tablespoon
16 tablespoons = 1 saucer