Yes, at last I’m going to share my secret with you! The secret that enabled me to rhyme pterodactyl with practical! Choose the important (in this case, the cute little dinosaur) at the end of the second line, and work backwards.That doesn’t make any sense, does it? Totally useless. Well, that’s how my brain works. Anyway, unless you improvise lyrics for a living, it doesn’t matter. BTW, I have finally found a decent slant rhyme for ‘purple.’ Bryn Terfel. Don’t bother using it unless you have an audience full of opera buffs.