AFTER the presentation of the string and BEFORE recalling the string via keyboard, they shall watch a movie and evaluate it.<trial Videos_Tor>
/ stimulustimes = [0=fixation, Videos_kein_Tor, Question]
/ validresponse = (a, l)
/ correctresponse = (l)</trial>Is it possible to build the <trial> within <openended> ? Or do I have to construct this on a <block> level?

3. after the video presentation, the string of letters/numbers shall be written downWith your help I programmed this text:<item cognitive_load>
/1="V98PYXGX"
/2="4XU01AT8"
/3="AVLWVW7W"
</item>

<item Videos_kein_Tor>
/1="Video_2.mp4"
/2="Video_3.mp4"
/3="Video_4.mp4"
</item>

<item Videos_Tor>
/1="Video_55.mp4"
/2="Video_57.mp4"
/3="Video_59.mp4"
</item>

<text fixation>
/ items = ("+")
</text>

<text mask>
/ items = ("       ")
</text>

<text Frage_Tor_kein_Tor>
/ items = ("Tor oder kein Tor?")
</text>

<text Entscheidung_Manipulation>
/ items = ("Entscheiden Sie spontan/reflektiv!")
/ size = (450,200)
/ txcolor = (50, 50, 255)
/ position = (50%, 52%)
/ valign = top
</text>

<text erinnerung_schreiben>
/ items = ("Bitte schreiben Sie jetzt die erinnerte Reihe auf"")
</text>

<video Videos_kein_Tor>
/ items = Videos
/ playthrough = true
/ size = (30%, 30%)
</video>

<video Videos_Tor>
/ items = Videos
/ playthrough = true
/ size = (30%, 30%)
</video>

<trial playvideo_kein_Tor>
/ stimulustimes = [0=fixation, Videos_kein_Tor, Frage_Tor_kein_Tor]
/ validresponse = (a, l)
/ correctresponse = (l)
/ pretrialpause = 500
</trial>

<trial playvideo_Tor>
/ stimulustimes = [0=fixation, Videos_Tor, Frage_Tor_kein_Tor]
/ validresponse = (a, l)
/ correctresponse = (a)
/pretrialpause = 500
</trial>

<trial V98PYXGX_1>
/stimulustimes = [0=fixation, 1000=V98PYXGX), 5000=mask]
</trial>

<openended V98PYXGX_2>
/ stimulustimes = [0=schreiben_erinnerung]
/ validresponse = (anyresponse)
/ correctresponse = ("V98PYXGX")
</openended>

<block basic_1>
/trials = [1 = V98PYXGX_1; 2 = noreplace(playvideo_kein_Tor, playvideo_Tor); 3 = V98PYXGX_2]
</block>

<trial 4XU01AT8_1>
/stimulustimes = [0=fixation, 1000=4XU01AT8), 5000=mask]
</trial>

<openended 4XU01AT8_2>
/ stimulustimes = [0=schreiben_erinnerung]
/ validresponse = (anyresponse)
/ correctresponse = ("4XU01AT8")
</openended>

<block basic_2>
/trials = [1 = 4XU01AT8_1; 2 = noreplace(playvideo_kein_Tor, playvideo_Tor); 3 = 4XU01AT8_2]
</block>

<trial AVLWVW7W_1>
/stimulustimes = [0=fixation, 1000=AVLWVW7W), 5000=mask]
</trial>

<openended AVLWVW7W_2>
/ stimulustimes = [0=schreiben_erinnerung]
/ validresponse = (anyresponse)
/ correctresponse = ("AVLWVW7W")
</openended>

<block basic_3>
/trials = [1 = AVLWVW7W_1; 2 = noreplace(playvideo_kein_Tor, playvideo_Tor); 3 = AVLWVW7W_2]
</block>

<block das_Grosse_Ganze>
/ trials = [1-3 = noreplace(basic_1, basic_2, basic_3)]
/ preinstructions = (Instruktion_1, Instruktion_2, Instruktion_3)
/ postinstructions = (thank_you)
</block>
Now, my question: For EACH SET of "string presentation - video presentation - string remembering"  I wrote an individual block (e.g. = block_1 ). The blocks (block_1, block_2, block_3,...) are picked randomly. However, I also want that within each set of  "string presentation - video presentation - string remembering" the video is picked randomly. That means: