tolerance - lower upper uncertainty upper lower while uncertainty tolerance set up loop middle (lower upper)/ choice print(lowerupperuncertainty upper lower soif we return to our basic structure we can now see how python' while syntax fits in we establish tolerance we establish an initial uncertainty we test for uncertainty tolerance as the loop test we recalculate the uncertainty at the end of the loop block for use in the next round of the test all we have to do now is to add in the choice block