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Constipation:

Type 1:
Separate hard lumps, like nuts (hard to pass). type1
Type 2:
Sausage shaped but lumpy.type2

Ideal stools:

Type 3:
Like a sausage but with cracks on the surface.type3
Type 4:
Like a sausage or snake, smooth and soft.type4

May indicate Diarrhea and urgency:

Type 5:
Soft blobs with clear-cut edges (passes easily)type5
Type 6:
Fluffy pieces with ragged edges, a mushy stool.type6
Type 7:
Watery, no solid pieces. Entirely liquid.type7

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References:
10. Heaton, K W & Lewis, S J 1997, 'Stool form scale as a useful guide to intestinal transit time'. Scandinavian Journal of Gastroenterology, vol.32, no.9, pp.920 - 924. Retrieved on 2/3/2007.