$(16\backslash \%)$ Define: $\backslash (\backslash$mathrm$\{$EA$\}=(\backslash$mathrm$\{$X$\})+\backslash )$ is the effective address equal to the contents of location $\backslash ($ X $\backslash ),$ with $\backslash ($ X $\backslash )$ incremented by one word length after the effective address is calculated; $\backslash (\backslash$mathrm$\{$EA$\}=-(\backslash$mathrm$\{$X$\})\backslash )$ is the effective address equal to the contents of location X $,$ with X decremented by one word length before the effective address is calculated; EA $=$