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{...}
type
a=(
january,
february,
march,
{--------------}
april,
may,
june,
{--------------}
jule,
august,
september,
{--------------}
october,
november,
december
             );
b=(
seаson1,
seаson2,
seаson3,
seаson4
           );
c=(
winter,
spring,
summer,
autumn
          );
{...}
function d(e:a):b;
         begin
              case e of
                       january,
                       february,
                       march
                                 :d:=seаson1;
                       april,
                       may,
                       june
                                 :d:=seаson2;
                       jule,
                       august,
                       september
                                 :d:=seаson3;
                       october,
                       november,
                       december
                                 :d:=seаson4
              end
         end;
function f(g:a):c;
         begin
              case g of
                       december,
                       january,
                       february
                                  :f:=winter;
                       march,
                       may,
                       april
                                  :f:=spring;
                       june,
                       jule,
                       august
                                  :f:=summer;
                       september,
                       october,
                       november
                                  :f:=autumn
              end
         end;
begin
{...}
end.