{if no_results OR segment_2 != "staff-bio" OR segment_4 != ""}{redirect="404"}{/if}

{if segment_4}{redirect="404"}{/if}
{if segment_2 != "staff-bio"}{redirect="404"}{/if}
{if segment_2 == "staff-bio"}
    {if segment_4 == ""}
        {exp:channel:entries [...] require_entry="yes"}
            {if no_results}{redirect="404"}{/if}
        {/exp:cahnnel:entries}
    {/if}
{/if}

{exp:ifelse parse="inward"}
    {if segment_4 != "" || segment_2 != "staff-bio"}
        {redirect="404"}
    {if:elseif segment_2 == "staff_bio"}
        {if segment_4 == ""}
            {exp:channel:entries [...] require_entry="yes"}
                {no_results}{redirect="404"}{/no_results}
            {/exp:cahnnel:entries}
        {/if}
    {/if}
{/exp:ifelse}