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loops can also be used in expression position to accumulate values. The value of the implicit accumulator is returned when the loop terminates.
<<collect E>>adds element E at the end of the list being collected. Can be used together will append
<<append L>>appends L at the end of the list being collected. Can be used together with collect
<<count B>>if B is true, adds 1 to the accumulated counter. Can be used together with sum
<<sum E>>adds E to the accumulated counter. Can be used together with count
<<maximize E>>replaces the current accumulated value if E is greater
<<minimize E>>replaces the current accumulated value if E is smaller
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