randomization

[Sau Hou Chang]

Hi,
>    I've some problems about randomization. Please
>share your experience and help me out. 
>    The stimuli are 5 words & their corresponding
>pictures. The procedure is:
>1. word in black. 
>2. either the previous word in red or the previous
>word in corresponding pictures.
>3. blank screen.
>
>    So, the whole procedure will show the 5 words in
>black 10 times, the 5 words in red 5 times, the 5
>words in corresponding pictures 5 times. 
>    My set up gives words in black 10 times, red 5
>times, and pictures 5 times. However, some of the
>words in red and some of the pictures are repeated.
It
>means some of the words are presented in red more
than
>one, but some are not presented. So are the pictures!
>    Even though I chose random selection, the
stimulus
>are chosen repeatedly. 
>    What should I do? 
>    Can anyone give me a thought?
>    Sau Hou
>

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