One who reads the Megillah may stand or sit. Whether one person read it, or two read it, they have fulfilled their obligation.  Where they are accustomed to recite a blessing [afterward], one should recite the blessing; [where the custom is] not to recite a blessing, one need not recite the blessing.  On Monday and Thursday, and on Sabbath afternoon, three [people] read [the Torah]; we may not decrease them nor add to them; and we do not conclude [the reading with a section] from the Prophets.  The one who commences and the one who concludes [the reading of] the Torah [respectively] recite the blessings [said] before it and after it.