6
ABCD EFGH down
ABGJ EFCK down
AFLI BEDH down
ABCD EFGH down
ABGJ EFCK even
ABCD EFGI even
ABCD EFGH even
ABCJ EFKL down
ABJK EFGL up
ABCD EFGH even
ABCJ EFKL down
ABJK EFGL down
ABCD EFGH even
ABCJ EFKL even
ABCD EFGI up
ABCD EFGH even
ABCJ EFKL even
ABCD EFGI down