key_or_not_null: ('primary')(?) 'key' |
                 'not' 'null' # if you put 'not null' then it won't grok things with two spaces

##</code><code>##

key_or_not_null: m/primary|/i 'KEY'

##</code><code>##

$"=$,,$_=q>|\p4<6 8p<M/_|<('=>
.q>.<4-KI<l|2$<6%s!<qn#F<>;$,
.=pack'N*',"@{[unpack'C*',$_]
}"for split/</;$_=$,,y[A-Z a-z]
         {}cd;print lc