Siman for the Days We Say Full Hallel

סימן להימים שקוראים בהם הלל שלם
The Medrosh on the verse (Bereshis 7, 9) שנים שנים באו אל נח, says that this is an allusion the days that we complete the Hallel, but without further explanation. Therefore, we could say as follows:

The days that we say a complete Hallel are: the first two days of Pesach, the two days of Shavous, the nine days of Sukkos, and the eight days of Chanukah. And this verse serves as a device to remember these days:

• שנים – Two days of Pesach
• שנים – Two days of Shavous
• באו – numerical value is 9 – nine days of Sukkos
• אל נח- numerical value is 89 –same numerical value as חנוכה