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(def a @[11 12]) # => @[11 12] (array/insert a 0 10) # => @[10 11 12] (array/insert a 3 13) # => @[10 11 12 13] (array/insert a -1 14) # => @[10 11 12 13 14] (array/insert a -1 15 16 17) # => @[10 11 12 13 14 15 16 17]