changed the .. word in slang to an infix range/2...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
minor bugfix...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
added a prefix construct...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
minor tweaks...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>