CREATE TABLE table_44198 ("NTSC M" TEXT, "PAL B , G , H" TEXT, "PAL I" TEXT, "PAL N" TEXT, "PAL M" TEXT)

Which PAL M has a PAL I of 50HZ?
SELECT "PAL M" FROM table_44198 WHERE "PAL I" = '50hz'
SELECT "PAL M" FROM "table_44198" WHERE "PAL I" = '50hz'