Multiple connected slurs

[Gerardo Ballabio]

Hello,
please what is the correct way to draw multiple slurs connected to
each other? Look at example below to see what I mean (result
attached).

The following code does what I want but it gives multiple warnings like these:

Parsing...
slur.ly:4:3: warning: Unattached SlurEvent
Interpreting music...
slur.ly:4:13: warning: cannot end slur

I tried using ties instead of slurs, that doesn't give warnings, but
it doesn't look quite the same.

Thanks
Gerardo

% slur.ly
%%%%%%%%%%
\version "2.24.1"

\new Staff \relative {
  ( c''1:32 ) | ( c1:32 ) | ( c1:32 ) | ( c4 ) r4 r2 |
}
%%%%%%%%%%

% tie.ly
%%%%%%%%%%
\version "2.24.1"

\new Staff \relative {
  c''1:32~ | c1:32~ | c1:32~ | c4 r4 r2 |
}
%%%%%%%%%%

slur.pdf
Description: Adobe PDF document

tie.pdf
Description: Adobe PDF document