name the military conflict whose commander was otelo saraiva de carvalho and took place in guinea-bissau ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_commander dbr_Otelo_Saraiva_de_Carvalho sep_dot var_uri dbo_place dbr_Guinea-Bissau sep_dot var_uri a dbo_MilitaryConflict brack_close