define: #pairs -> ({'hello' -> 1. 'world' -> 2. '!' -> 3. 'another!' -> 3} as: Dictionary).
pairs keysAndValuesDo: [| :key :value |
  inform: '(k, v) = (' ; key printString ; ', ' ; value printString ; ')'
].

pairs keysDo: [| :key |
  inform: '(k, v) = (' ; key printString ; ', ' ; (pairs at: key) printString ; ')'
].

pairs do: [| :value |
  inform: 'value = ' ; value printString
].