[Jprogramming] Strange behavior write 1!:2 verb

['Sergey Kamenev' via Programming]

Hi!

  'aaa' (1!:2) 2
aaa
aaa
    'aaa' (1!:2) 4
aaaaaa

Why echoed text is duplicated?
Why I see different types of duplication?

I need verb like 'echo' but without printing carriage return.
Which standart way for this?

Sergey.