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בפסד"ז אתה ה' לא תכלא רחמיך ממני ביו"ד והאומר בוא"ו שבוש הוא בידו. באשרי זכר רב טובך ב' סגלין: In 'Pesukei Dezimra' the phrase "You, GD, don't withhold Your mercy from me" is with a Yud, and one who says it with a Vav is in error [Lit: on his hand]. In the paragraph of 'Ashrei' the phrase "They will recount your bountiful goodness" contains two Segol (vowels). (Presumably on the word 'Zecher')