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The specification is simple: given a list of numbers, return the two which are nearest to one-another. Assume that the list contains at least two numbers, and the return order is irrelevent. Some foolhardy attempts of my own follow:
```# 114 chars
sub nn1 {
my@p;my\$d;for(0..\$#_-1){for my\$n (\$_+1..\$#_){my\$e=abs\$_[\$_]-\$_[\$n];i
+f(!defined\$d or\$e<\$d){\$d=\$e;@p=@_[\$_,\$n];}}}@p
}

# 100 chars
sub nn2 {
my@l=sort@_;\$l[\$_]=[@l[\$_,\$_+1]]for 0..\$#l;pop@l;@{(sort{abs\$\$a[0]-\$
+\$a[1]<=>abs\$\$b[0]-\$\$b[1]}@l)[0]}
}

# 87 chars
sub nn3 {
@_=sort@_;my%d;\$d{abs\$_[\$_]-\$_[\$_+1]}=[@_[\$_,\$_+1]]for 0..\$#_-1;@{\$d
+{(sort keys%d)[0]}}
}
Update: regarding the issue of duplicates, assume they are pairs like any other, so you would return duplicate numbers if they were present in the list.
```   MeowChow
s aamecha.s a..a\u\$&owag.print```

In reply to (Golf) Nearest Neighbors by MeowChow

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