Typing accents on the Macintosh

For character
  at the same time as and then
á, é, í, ó, ú
= alt
option
+ e , a, e, i, o, u
à, è, ì, ò, ù
= alt
option
+ ~
`
, a, e, i, o, u
ä, ë, ï, ö, ü
= alt
option
+ u , a, e, i, o, u
â, ê, î, ô, û
= alt
option
+ i , a, e, i, o, u
ç
= alt
option
+ c
œ
= alt
option
+ q