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How to create a list, a hash or a sequence

Code

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<#assign mylist=["red","blue","green"]>
${mylist[0]} -> "red"

<#assign myhash={"aa":"01","bb":"02","cc":"03"}>
${myhash.aa} -> "01"

<#assign myhastsequence={"aa":[{"art":"desk"},{"art":"chair"}]}>
${myhastsequence.aa[1].art} -> "chair"

<#assign mysequence = [
 {"name":"whale", "weight":2000},
 {"name":"Barbara", "weight":53},
 {"name":"zeppelin", "weight":-200},
 {"name":"aardvark", "weight":30},
 {"name":"beetroot", "weight":0.3}
]>
${mysequence[1].name} -> "Barbara"