All the above-mentioned words with two equally strong stresses are subjected to the influence of English rhythm in connected speech.
Thus in a double-stressed word the first element is weakened ;f it is preceded by another stressed syllable or the second stress is likewise lost if it is followed by a stressed syllable, eg;
— How many students are there in your group?
— -* Thirteen.
"* Find 'room thirteen.
I have Vlooked 'through 'thirteen ^books today. <>r an "* absent-minded vman but: ~* so absent-xminded •in ~* unknown land but: ~+ quite un4known.