Is it legal a sequence diagram without lifeline?

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i've my project and this is my Sequence Diagram. Is it legal? enter image description here

Can i start my sequence diagram like that?

visual-paradigm sequence-diagram uml
1 Answers

The first message on the left is a found message (see §17.4.4.1 page 577 of formal/2017-12-05) and its use is perfectly legal.

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