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| irb(main):031:0> def hey(s) | |
| irb(main):032:1> s << "bbc" | |
| irb(main):033:1> end | |
| => :hey | |
| irb(main):034:0> a = "abc" | |
| => "abc" | |
| irb(main):035:0> hey(a) | |
| => "abcbbc" | |
| irb(main):036:0> a | |
| => "abcbbc" |
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