A-code command parsing

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Identifying words: all forced to lower case; automatic abbreviations and error correction (see the vocabulary document for details).

Basic command: "verb" or "verb noun".

The AGR1, ARG2 and STATUS variables and their values (including error values).

Default object.

Description scanning for missing vovabulary words

Multiple commands per line: separators '.' (full stop), or ; (semicolon) or the word then.

Explicit object iteration: separators ',' (comma) or the word and.

Implicit object iteration: the DOALL directive.

The except syntax.

Uses of it.

The again (or repeat) verb. On is own and in a multiple command line.

Attempted disambiguation.

Error handling.