# Make a list with 2 lists **URL:** \ **Category:** Lists-Logic\ **Created:** [June 10, 2016, 8:07pm UTC](https://forum.dynamobim.com/t/make-a-list-with-2-lists/4445 "2016-06-10T20:07:29Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Bardur\_Thomassen](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/bardur_thomassen/32/6395_2.png) [@Bardur\_Thomassen](https://forum.dynamobim.com/u/Bardur_Thomassen)\ **Post date:** [June 10, 2016, 8:07pm UTC](https://forum.dynamobim.com/t/make-a-list-with-2-lists/4445/1 "2016-06-10T20:07:29Z")
Hi guys. I’am trying to make a list with 2 lists. The 2 listis will contains all horizontal mullions. See pictures. Later on I will delete all mullions except 1 random mullion. It works for now, But I must use “getitembyindex” for each listi. Hope you understand my quesetion Thanks regards Bárður ![](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/2X/9/97e1acd0bb2a3032687d96909e14b3f307f06b37.PNG) ![](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/2X/f/f4810fb26b41ace71c5c92b362ca0f31eba4d851.PNG)[HomeZETA.dyn](https://forum.dynamobim.com/uploads/short-url/4qgWqxONzO73xYo0Bpy23flVfoM.dyn) (22.5 KB) ---
**Author:** ![Vikram\_Subbaiah](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/vikram_subbaiah/32/50797_2.png) [@Vikram\_Subbaiah](https://forum.dynamobim.com/u/Vikram_Subbaiah)\ **Post date:** [June 11, 2016, 1:41am UTC](https://forum.dynamobim.com/t/make-a-list-with-2-lists/4445/2 "2016-06-11T01:41:32Z")
You want one random element from each list? ![](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/2X/b/bd0bdd19c8682830f95a90c3c51859f7e141e611.png) [RandomElementFromList.dyn](https://forum.dynamobim.com/uploads/short-url/wuVpYklNOxMV9yftqvFQLpo9Lcn.dyn) (4.9 KB) ---
**Author:** ![Bardur\_Thomassen](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/bardur_thomassen/32/6395_2.png) [@Bardur\_Thomassen](https://forum.dynamobim.com/u/Bardur_Thomassen)\ **Post date:** [June 11, 2016, 8:30pm UTC](https://forum.dynamobim.com/t/make-a-list-with-2-lists/4445/3 "2016-06-11T20:30:12Z")
Thank you Vikram That is not my problem. But perhaps I will you this lsyrt in this project. I have hard time to explane what I meen. But in the picture you can see the problem. I can’t put to sublists in to the list.filterbyboolmask. But if I put getitembyindex it works. ![](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/2X/8/8a2c1c75a936e4c99cfcfeaaa27721af1b071f87.PNG) ---
**Author:** ![Vikram\_Subbaiah](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/vikram_subbaiah/32/50797_2.png) [@Vikram\_Subbaiah](https://forum.dynamobim.com/u/Vikram_Subbaiah)\ **Post date:** [June 12, 2016, 3:38am UTC](https://forum.dynamobim.com/t/make-a-list-with-2-lists/4445/4 "2016-06-12T03:38:56Z")
You will need to use List.Map as you are applying two different filter masks to a single list ![](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/2X/3/3e9db34c4c1752c4db57a1e85252bb5dc03404e3.png) ---
**Author:** ![Bardur\_Thomassen](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/bardur_thomassen/32/6395_2.png) [@Bardur\_Thomassen](https://forum.dynamobim.com/u/Bardur_Thomassen)\ **Post date:** [June 12, 2016, 9:09pm UTC](https://forum.dynamobim.com/t/make-a-list-with-2-lists/4445/5 "2016-06-12T21:09:43Z")
Thank you very much Virkam, that solves this problem. but but… I have one “small” problem… I wan’t to remove the higest and lowest mullion in the list… It seems to work, but it don’t do you see the problem? ![](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/2X/a/a2aa5088a7dcc5e48a71ce6e9289d14900917dc1.PNG) ---
**Author:** ![Vikram\_Subbaiah](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/vikram_subbaiah/32/50797_2.png) [@Vikram\_Subbaiah](https://forum.dynamobim.com/u/Vikram_Subbaiah)\ **Post date:** [June 13, 2016, 6:50am UTC](https://forum.dynamobim.com/t/make-a-list-with-2-lists/4445/6 "2016-06-13T06:50:59Z")
The problem is that you are trying to remove items at two indices at once. Do it in sequence - First remove the min item, from the resulting list remove the max item ---
**Author:** ![Bardur\_Thomassen](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/bardur_thomassen/32/6395_2.png) [@Bardur\_Thomassen](https://forum.dynamobim.com/u/Bardur_Thomassen)\ **Post date:** [June 14, 2016, 7:41am UTC](https://forum.dynamobim.com/t/make-a-list-with-2-lists/4445/7 "2016-06-14T07:41:46Z")
That was it. Thank you ones again. Bárður