Similarly, Apple, having gone through traumatic events in the past, is content to let the cash on its balance sheet pile up.

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As the depth increases further, the sheet pile wall (the vertical brown members in the image) would need to stronger and stronger (heavier).

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At least its pile of cash and pristine balance sheet and bond credit rating has not been affected.

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There were, he announced, only three basic cloud types, and he gave each a Latin name befitting its appearance: cirrus for fiber, cumulus for heap or pile and stratus for layer or sheet.

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