affects the similarity of sounds for the perception of rhyme. Perfect rhyme can be defined as the case when two words rhyme if their final stressed vowel and all following sounds are identical. Some words in English, such as "orange" and "silver", are commonly regarded as having no rhyme. Although a clever writer can get around this (for example, by obliquely rhyming "orange" with combinations of words like "door hinge" or with lesser-known words like "Blorenge" – a hill in Wales – or the surname Gorringe), it is generally easier to move the word out of rhyming position or replace it with a synonym ("orange" could become "amber", while "silver" could become a combination of "bright and argent"). A skilled orator might be able to tweak the pronunciation of certain words to facilitate a stronger rhyme (for example, pronouncing 'orange' as 'oringe' to rhyme with 'door hinge') One view of rhyme in English is from John Milton's preface to Paradise Lost: A more tempered view is taken by W. H. Auden in The Dyer's Hand: Forced or clumsy rhyme is often a key ingredient of doggerel. French In French poetry, unlike in English, it is common to have identical rhymes, in which not only the vowels of the final syllables of the lines rhyme, but their onset consonants ("consonnes d'appui") as well. To the ear of someone accustomed to English verse, this often sounds like a very weak rhyme. For example, an English perfect rhyme of homophones, flour and flower, would seem weak, whereas a French rhyme of homophones doigt ("finger") and doit ("must") or point ("point") and point ("not") is not only acceptable but quite common. Rhymes are sometimes classified into the categories of "rime pauvre" ("poor rhyme"), "rime suffisante" ("sufficient rhyme"), "rime riche" ("rich rhyme") and "rime richissime" ("very rich rhyme"), according to the number of rhyming sounds in the two words or in the parts of the two verses. For example, to rhyme "tu" with "vu" would be a poor rhyme (the words have only the vowel in common), to rhyme "pas" with "bras" a sufficient rhyme (with the vowel and the silent consonant in common), and "tante" with "attente" a rich rhyme (with the vowel, the onset consonant, and the coda consonant with its mute "e" in common). Authorities disagree, however, on exactly where to place the boundaries between the categories. Holorime is an extreme example