SRC_D = 
SRC_E = 1a_hamilton.cpp 1b_rpn.cpp 1c_shuffle.cpp 2a_colours.cpp 2b_parse.cpp 2c_packed.cpp
# 7bcf7b81c14f42840d50181d688c3eacf79713b3  1a_hamilton.cpp
# 27bc0b0a0b67cf1df3b2fc96f8caf4583decbcde  1b_rpn.cpp
# a2cd9659fd0c4ea345d5904918f82b64af94e1f8  1c_shuffle.cpp
# 7c77a33a562e2236254e9efc7cc16b32cc1b818f  2a_colours.cpp
# 1d6deeaffaec3b502a3d37d2a73fcb6d9e55c5e7  2b_parse.cpp
# ffb69279f9e315925f92cc292a31f5fd89d8c3d5  2c_packed.cpp