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How to pronounce the name of the sefer “Bnei Yso(s)cher”

How does one pronounce the name of the sefer בני יששכר ?

I've heard people pronounce both sins -- so it is Ysoscher. (There is also a common custom to pronounce the name יששכר with both sins the first time it appears in the Torah, and thereafter with only one sin.) But recently I heard someone pronounce the sefer Ysocher, with only one sin, the way it is usually pronounced in the Torah. So which is correct?