Related for Berakhot 67:15

Why did they say one short [Beracha (blessing)]? In the place where they said to be long, one is not allowed to be short, [and in the place where they said] to be short, one is not allowed to be long. [In the place where they said] to seal off [the Beracha], one is not allowed not to seal off, [in the place where they said] not to seal off [the Beracha], one is not allowed to seal off. [In the place where they said] to begin [the Beracha] with [the word] Baruch (Blessed), one is not allowed not to begin with Baruch, [in the place where they said] not to begin [the Beracha] with Baruch, one is not allowed to begin with Baruch. [In the place where they said] to bend down, one is not allowed not to bend down , [and in the place where they said] not to bend down, one is not allowed to bend down.

These are the Berachot (blessings) which begin with [the phrase] Baruch [Ata Hashem] (Blessed are You Hashem). All Berachot begin with [the phrase] Baruch [Ata Hashem] except for the Beracha (blessing) which is adjacent to Shema and a Beracha which is adjacent to another Beracha, in [both of] which [cases] we do not begin with [the phrase] Baruch [Ata Hashem].