Peter like travel train he like train fall asleep once summer Peter go train city a city b usual sleeping then wake start look window notice railway station flag particular colourthe boy start memorize order flag colour see but soon fall asleep unfortunately do not sleep long wake go memorize colour then fall asleep time sleep till end journeyAt station tell parent write sequence colour see sleep respectivelypeter parent know son like fantasize they list flag colours station train pass sequentially way a b ask find Peter sequence way A b B a remember Peter period wakefulnesspeter parent lowercase latin letter colour the letter stand colour different letter different colour