# Pfc pack (forward chaining) -- can't get to work

**URL:** <https://swi-prolog.discourse.group/t/pfc-pack-forward-chaining-cant-get-to-work/2662>\
**Category:** Pack\
**Tags:** pfc\
**Created:** [July 20, 2020, 3:22pm UTC](https://swi-prolog.discourse.group/t/pfc-pack-forward-chaining-cant-get-to-work/2662 "2020-07-20T15:22:09Z")\
**Posts on this page:** 1\
**Showing post:** 28

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**Author:** ![logicmoo](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/logicmoo/32/193_2.png) [@logicmoo](https://swi-prolog.discourse.group/u/logicmoo)\
**Post date:** [July 21, 2020, 9:28am UTC](https://swi-prolog.discourse.group/t/pfc-pack-forward-chaining-cant-get-to-work/2662/28 "2020-07-21T09:28:51Z")

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Hi,

Sorry I did not notice the messages until late. Will work to make sure it’s working correctly with the right dependencies for the next hours.

ain = “add if new”

Tim’s “add/1” predicate was too conflicting

Removing male(joe)

Is accomplished by  
ain( + gender(joe, male)).

the + means not present

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