$\backslash$table$[[$Impressions$,$Clicks,Revenue$],[$airline ticket,airworld,airworld$],[$airfare$,$airline ticket,$[$air world$]],[$discount airfare,$[$air world$],$air world$],[$athens greece,air world,air world com$],[$greece travel,airfare,airline ticket$]]$

Looking at your completed "Top $5"$ table above, discuss the similarities and differences in the keyword rankings across the measures. What implications do the differences have for keyword bidding strategy?