(d) Third contamination: 
(e) Forth contamination: 
(f) Fifth contamination: 
(g) Sixth contamination: 
(h) Seventh contamination: 
| (d) Third contamination: | |
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| (e) Forth contamination: | |
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| (f) Fifth contamination: | |
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| (g) Sixth contamination: | |
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| (h) Seventh contamination: | |
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