Robert Frost's The most typical usage of iambs in poetry is in pentameter, which indicates that the poem has five "feet," or units of stressed and unstressed syllables. However, because this poem is written in iambic tetrameter, there are only four feet (tetra = four). Even so, it is possible to say that the road not taken takes its rhythmic structure from pentameter by using two pairs of iambs as its rhyme scheme. Paired iambs are found in many English poems. This device gives the appearance of more feet than there actually are. For example, "double" iambs appear twice in this line from John Milton's Areopagitica: "For truth's sake take hands and stand up for her." There are actually only one pair of iambs here, since they follow an accented syllable. But by using this technique, Milton shows that he is willing to risk unusual alliteration or other effects if it means getting more emphatic syllables into his poem. Double iambs can also be found near the beginning of Shakespeare's As you like it: "As you like it, merrily"'. Since these iambs appear at the start of two separate lines, they function as a form of introductory verse. They are followed by regular iambs that continue the theme of the play.