brainvita solution

a     b     c    d     e     f     g

B	B	C1	D1	E1	B	B
B	B	C2	D2	E2	B	B
A3	B3	C3	D3	E3	F3	G3
A4	B4	C4	d4	E4	F4	G4
A5	B5	C5	D5	E5	F5	G5
B	B	C6	D6	E6	B	B
B	B	C7	D7	E7	B	B

consider a  7 x 7 matrix as above. B represents blanks where there would be no brainvita coin. (so wd d4)

Solution then would be:

d6d4-b5d5-c7c5-d5d3-a5c5-f5d5-d4d6-d7d5-e7e5-d5d7-g5e5-c4c6-e4e6-a4c4-g4e4-c3c5-c6c4-e3e5-e6e4-c1c3-c4c2-e1e3-e4e2-a3c3-g3e3-c3c1-c1e1-d3f3-e1e3-f6f4-d2d4