Examine the sequences of points in parts a–f for any trends.

a. + + – – – – – + + + + 

b. – + – – – + + – + + + +

c. – – – – – + + + + + – – 

d. – +++++ – ++++++++

e. + – + + + – – + + – 

f. – + + + + + + + + + –