Based on the recent adverbs discussion, here’s a proposed change to matrix.tdl:

CURRENT:

```
intersective-mod-lex := no-hcons-lex-item &
[ SYNSEM [ LOCAL.CAT.HEAD.MOD < [ LOCAL intersective-mod &
[ CONT.HOOK.INDEX #ind ]] >,
LKEYS.KEYREL.ARG1 #ind ] ].
```

PROPOSED:

```
basic-intersective-mod-lex := lex-item &
[ SYNSEM [ LOCAL.CAT.HEAD.MOD < [ LOCAL intersective-mod &
[ CONT.HOOK.INDEX #ind ]] >,
LKEYS.KEYREL.ARG1 #ind ] ].
intersective-mod-lex := basic-intersective-mod-lex & no-hcons-lex-item.
; OZ 2019-05-22 Adverbs may need multiple relations (e.g. "where" we want
; to correspond to "to which place"), so we need to be able to
; use HCONS.
intersective-adverb-lex := basic-intersective-mod-lex.
no-mod-lex := no-hcons-lex-item &
[ SYNSEM.LOCAL.CAT.HEAD.MOD < > ].
```

The regression tests pass.