Searching for a location with in Pairs

        cells = {}


        cells[1] = { assigned = "a", location = 69 }
        cells[2] = { assigned = "b", location = 71 }
        cells[3] = { assigned = "c", location = 73 }
        cells[4] = { assigned = "d", location = 75 }

        cells[5] = { assigned = "e", location = 101 }
        cells[6] = { assigned = "f", location = 103 }
        cells[7] = { assigned = "j", location = 105 }
        cells[8] = { assigned = "h", location = 107 }

        cells[9] = { assigned = "i", location = 133 }
        cells[10] = { assigned = "j", location = 135 }
        cells[11] = { assigned = "j", location = 137 }
        cells[12] = { assigned = "l", location = 139 }

        cells[13] = { assigned = "m", location = 165 }
        cells[14] = { assigned = "n", location = 167 }
        cells[15] = { assigned = "o", location = 169 }
        cells[16] = { assigned = "p", location = 171 }

-- I know how to do this with for i=1, #cells do if cells[i].location==133 then cellToEdit=i;end;end

--but now I want to use ipairs to locate the one with location 133.