There is one specialised form of alliteration called Symmetrical Alliteration . That is, alliteration containing parallelism .  In this case, the phrase must have a pair of outside end words both starting with the same sound, and pairs of outside words also starting with matching sounds as one moves progressively closer to the centre. For example, "rust brown blazers rule", "purely and fundamentally for analytical purposes" or "fluoro colour co-ordination forever". Symmetrical alliteration is similar to palindromes in its use of symmetry.