Spanish letter r 

This letter can exhibit two sounds: Alveolar tap /ɾ/ and Alveolar trill /r/

The alveolar tap or flap is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents dental, alveolar, and postalveolar flaps is [ɾ].
And it occurs when the 'r' is not a 'rr' or follows 'l' or 'n'
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Sound 1: Alveolar flap /ɾ/ /ko̞n̪.t̪äˈxjäɾ/ (to infect)    /bän̪ˈd̪e̞.ɾä/ (flag) /äˈse̞.ɾä/ (sidewalk)    /ke̞ˈxäɾ.se̞/ (to complain) /äˈɾis.ko̞/ (surly)    /ˈfɾe̞.no̞/ (brake) /me̞.xo̞ˈɾäɾ/ (to improve)    /t̪e̞.me̞ˈɾä.ɾjo̞/ (reckless) /e̞s.ko̞ˈxe̞ɾ/ (to choose)    /be̞ɾ.däˈðe̞.ɾo̞/ (true)

The alveolar trill is a type of consonantal sound, used in many spoken languages. The symbol in the International Phonetic Alphabet that represents dental, alveolar, and postalveolar trills is ⟨r⟩, and the equivalent X-SAMPA symbol is r.

And it occurs when the 'r' is a 'rr' or follows  'n' or in absolute initial position

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Sound 2: Voiced alveolar trill /r/ /in̪.t̪e̞.rumˈpiɾ/ (to interrupt)    /ruˈt̪i.nä/ (routine) /ro̞ˈsä.ðo̞/ (pink)    /re̞.pe̞n̪ˈt̪i.no̞/ (sudden) /re̞.fle̞.ksjo̞ˈnäɾ/ (to reflect)    /re̞ˈt̪i.ɾo̞/ (retirement) /e̞n.ro̞sˈkäɾ/ (to twist)    /e̞n.ro̞ˈʝäɾ/ (to coil) /e̞n.ri.ke̞ˈse̞ɾ/ (to enrich)    /e̞n.ro̞ˈläɾ/ (odd)

 The letter s