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/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 can use this as a template for your own conditial trial definitions.
%
% Use this function by calling
%   [cfg] = ft_definetrial(cfg)

    
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 can use this as a template for your own conditial trial definitions.
%
% Use this function by calling
%   [cfg] = ft_definetrial(cfg)
% where the configuration structure should contain
%   cfg.dataset           = string with the filename
%   cfg.trialfun          = 'ft_trialfun_example1'
%   cfg.trialdef.prestim  = number, in seconds
%   cfg.trialdef.poststim = number, in seconds
%
% See also FT_DEFINETRIAL, FT_TRIALFUN_GENERAL

% 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
prestim  = -round(cfg.trialdef.prestim  * hdr.Fs);
poststim =  round(cfg.trialdef.poststim * 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) + prestim;
    trlend