Nazir

The problem was left unsolved. MISHNAH. [IF A MAN SAYS,] 'I INTEND TO BE A NAZIRITE [NOW] AND A NAZIRITE WHEN I SHALL HAVE A SON', AND BEGINS TO RECKON HIS OWN [NAZIRITESHIP]. AND THEN HAS A SON BORN TO HIM, HE IS TO COMPLETE HIS OWN NAZIRITESHIP] AND THEN RECKON THE ONE ON ACCOUNT OF HIS SON. [IF HE SAYS,] 'I INTEND TO BE A NAZIRITE WHEN I SHALL HAVE A SON, AND A NAZIRITE [ON MY OWN ACCOUNT]', AND HE BEGINS TO RECKON HIS OWN [NAZIRITESHIP] AND THEN HAS A SON BORN TO HIM, HE MUST INTERRUPT HIS OWN [NAZIRITESHIP], RECKON THE ONE ON ACCOUNT OF HIS SON, AND THEN COMPLETE HIS OWN. GEMARA. Raba put the following question. If he should say, 'I wish to be a nazirite  after twenty days time,' and then 'For one hundred days commencing now', what would be the law? Seeing that these hundred days will not be complete in twenty, are they to be inoperative [for the time being]  or, seeing that there will remain sufficient time afterwards  for the hair to grow long,  do they come into operation [immediately]? Why does [Raba] not [first] raise the question of a [second] naziriteship of short duration?  It is a problem within a problem that he has raised: