You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: ft_trialfun_example1.m
    path of file: ./repos/spm12/external/fieldtrip/trialfun
    
    the code of the file until where you have to start completion: function [trl, event] = ft_trialfun_example1(cfg)

% FT_TRIALFUN_EXAMPLE1 is an example trial function. It searches for events
% of type "trigger" and specifically for a trigger with value 7, followed
% by a trigger with value 64.
% 
% You would use this function as follows
%   cfg           = [];   
%   cfg.dataset   = string, containing filename or directory
%   cfg.trialfun  = 'ft_trialfun_example1';
%   cfg           = definetrial(cfg);
%   data          = preprocessing(cfg);
%
% You can use this example trial function as template for your own
% conditial trial definitions.
%
% See also FT_DEFINETRIAL, FT_PREPROCESSING

% read the header information and the events from the data
hdr   = ft_read_header(cfg.dataset);
event = ft_read_event(cfg.dataset);

% search for "trigger" events
value  = [event(find(strcmp('trigger', {event.type}))).value]';
sample = [event(find(strcmp('trigger', {event.type}))).sample]';


    
function [trl, event] = ft_trialfun_example1(cfg)

% FT_TRIALFUN_EXAMPLE1 is an example trial function. It searches for events
% of type "trigger" and specifically for a trigger with value 7, followed
% by a trigger with value 64.
% 
% You would use this function as follows
%   cfg           = [];   
%   cfg.dataset   = string, containing filename or directory
%   cfg.trialfun  = 'ft_trialfun_example1';
%   cfg           = definetrial(cfg);
%   data          = preprocessing(cfg);
%
% You can use this example trial function as template for your own
% conditial trial definitions.
%
% See also FT_DEFINETRIAL, FT_PREPROCESSING

% read the header information and the events from the data
hdr   = ft_read_header(cfg.dataset);
event = ft_read_event(cfg.dataset);

% search for "trigger" events
value  = [event(find(strcmp('trigger', {event.type}))).value]';
sample = [event(find(strcmp('trigger', {event.type}))).sample]';

% determine the number of samples before and after the trigger
pretrig  = -round(cfg.trialdef.pre  * hdr.Fs);
posttrig =  round(cfg.trialdef.post * hdr.Fs);

% look for the combination of a trigger "7" followed by a trigger "64" 
% for each trigger except the last one
trl = [];
for j = 1:(length(value)-1)
  trg1 = value(j);
  trg2 = value(j+1);
  if trg1==7 && trg2==64
    trlbegin = sample(j) + pretrig;       
    trlend