[Newbies] 'evaluating SokobanMorph random openInWorld in a workspace'

[vmars]

in Squeak by example:
Fig 1.14:'Using SqueakMap to install the Sokoban game'. It says, after
installing this package, start up Sokoban by 'evaluating SokobanMorph random
openInWorld in a workspace'. 
I have no idea 'how' to do this.
Anyone?
Thanks..vm
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