I am the walrus

5 x 200 on 2:50/3:10 alt free/back EN1

1x{1 x 200 free EN1
{1 x 400 IM EN1
{1 x 600 free EN1
{1 x 800 IM EN1
{1 x 100 free EN1
:10 rest

4x{3 x 50 on :50 back EN2
{2 x 75 on 1:15 IM EN2
{1 x 200 on 3:00 free EN3

6,000 meters SCM