Shehem Shavuah Echad U'Shlosha Yamim laOmer. Today is ten days. That is One week and three days of the Omer. Hayom Achad Asar Yom. Shehem Shavuah Echad Vaarbaah Yamim laOmer.
Today is eleven days.
That is One week and four days of the Omer. Hayom Shneiim Asar Yom. Shehem Shavuah Echad Vichamisha Yamim laOmer. Today is twelve days. That is One week and five days of the Omer.