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# Re: handling lists in perl

```On 2018-12-19 08:34, deloptes wrote:
```
```mick crane wrote:

```
```yes but there is only one 100, only one key can have it.
I still try to figure out what goes on with the hash pairs
with a longer list of numbers your example seems to pick up on the
values somehow.
I dunno, unless there is something about using \$_ in a loop being
unreliable ?
I persevere to succeed
```
```
(1=>8,2=>20,6=>100,15=>100....)

```
this is what you originally posted, so both 6 and 15 match 100 from the list
```
```
when key is 6 it compares 100 with each element from the list and matches
```100. Same goes for 15.
No idea what you mean!

regards
```
```

```
given a set of *unique* numbers ( there is just one of the numbers in the list) and a list of possible pairings find which pairs you can make from the list. 6 can pair with 100 and 15 can pair with 100 but they cannot both be in the list of possible pairings because there is only one 100.
```

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Key ID    4BFEBB31

```