سپس ، در طی چند سال کوتاه ، دفاتر 10 ، 15 و حتی 20 داستان با فرکانس هشدار دهنده ظاهر می شدند .
Then, in a matter of a few short years, offices of 10, 15, and even 20 stories were appearing with alarming frequency.