90- & \multicolumn{2}{l}{1) those in which wealthier people live} & 2) in those which wealthier people live & \multicolumn{2}{l}{3) wealthier people in which they live} & 4) wealthier people live in
\textbf{90-} & \multicolumn{2}{l}{1) those in which wealthier people live} & 2) in those which wealthier people live \\
& \multicolumn{2}{l}{3) wealthier people in which they live} & 4) wealthier people live in \\