[NOVICE] multiple foreign keys for a row - Mailing list pgsql-novice

Readers,

Scenario:
table1
headercolumn1 headercolumn2 headercolumn3
1 texta textb textc 200.987

table2
texta
textb
textc

The requirement is that 'texta' 'textb' 'textc' (either any combination
or all) appear in the column labelled 'headercolumn2'.

How to amend the standard instruction to use foreign keys (manual
§5.3.5) to refer to table2?