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To access a member of a Sequence we can use the operator `` [ ] '' with an appropriate position index . Tindall distinguishes between " sign " and " symbol " and defines the latter in regard to form as " analogical embodiment " and in regard to content as " a complex of feeling and thought " ( Literary Symbol , pp . TWRA , as evidence that Sea-Land knew of an equipment substitution abuse problem and did nothing about it ; that the first report cited four equipment substitution shipments , while the second cited one shipment ; that Sea-Land processed 8 - 10,000 shipments per week in its Dallas documentation center ; that the neutral body 's reports alerted Sea-Land to a " potential " problem that needed to be addressed , although it did not signal an " epidemic " ;( 21 ) and that Sea-Land took appropriate and reasonable steps to address the problem under the circumstances . Deep-seated prejudice exists [ toward Roma ] and that will have to be changed , " Stanisich told " ( Un ) Civil Societies . The prior art on the use of " :-( " goes back decades .