====== Material preparation ======

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    stock_photo:labs:nat_prod:activities:material_prep:material_prep1 |
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    material_prep1 
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    stock_photo:labs:nat_prod:activities:material_prep:material_prep2 |
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    material_prep2 
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    stock_photo:labs:nat_prod:activities:material_prep:material_prep3 |
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    material_prep3 
>
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    stock_photo:labs:nat_prod:activities:material_prep:material_prep4 |
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    material_prep4 
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    stock_photo:labs:nat_prod:activities:material_prep:material_prep5 |
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    material_prep5 
>
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    stock_photo:labs:nat_prod:activities:material_prep:material_prep6 |
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    material_prep6 
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    stock_photo:labs:nat_prod:activities:material_prep:material_prep7 |
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    material_prep7 
>
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    stock_photo:labs:nat_prod:activities:material_prep:material_prep8 |
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    material_prep8 
>