My main idea is the same as Anna had. In my experiment I need to randomly present 100 blocks without replacement. I want every block to be presented exactly once and in a random order. "Noreplace" does not seem to work. There are always some blocks presented more than once. I also tried </defaults> / resetinterval = 0 </defaults> but maybe I am using it the wrong way or it does not help neither.
This is how (the important part of my) experiment looks like:
<defaults> / font = ("Arial", -21, 400, 0, 34)
/ txbgcolor = (250, 250, 250) / screencolor = (250, 250, 250)
/ pretrialpause = 0 / posttrialpause = 150
/endlock = true
/ resetinterval = 0
</defaults>
<text cue1>
/ numitems = 1
/ items = ("xy")
/ font = ("Arial", -37, 700, 0, 34) / position = (50,85) / color = (0, 0, 0) / area = (900,200)
</text>
<picture pic_1>/numitems = 1 / items = ("1.jpg") / position = (50, 1) / valign = top / size=(672, 813,12)</picture>
<picture pic_2>/numitems = 1 / items = ("2.jpg") / position = (50, 1) / valign = top / size=(672, 813,12)</picture>
<picture pic_3>/numitems = 1 / items = ("3.jpg") / position = (50, 1) / valign = top / size=(672, 813,12)</picture>
<likert person_1> / numpoints = 7 / anchors = [1 = "gar nicht"; 7 = "sehr"]
/ stimulusframes = [1= pic_1, cue1] / position = (50, 90) / anchorwidth = 6% </likert>
<likert person_2> / numpoints = 7 / anchors = [1 = "gar nicht"; 7 = "sehr"]
/ stimulusframes = [1= pic_2, cue1] / position = (50, 90) / anchorwidth = 6% </likert>
<likert person_3> / numpoints = 7 / anchors = [1 = "gar nicht"; 7 = "sehr"]
/ stimulusframes = [1= pic_3, cue1] / position = (50, 90) / anchorwidth = 6% </likert>
...
<block blockp1>/ trials = [1=person_1]</block>
<block blockp2>/ trials = [1=person_2]</block>
<block blockp3>/ trials = [1=person_3]</block>
...
<expt ratings>
/ blocks = [1-100= noreplace (blockp1,blockp2,blockp3,blockp4,blockp5, ..., blockp100)]
</expt>