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Soromania, learn japanese abacus SOROBAN
from addition to subtraction
train your brain
sub-diamond: 1d/5n (7s)
sub-diamond: 1d/5n (6s)
sub-diamond: 1d/5n (5s)
sub-diamond: 1d/5n (4s)
sub-diamond: 1d/5n (3s)
sub-diamond: 1d/10n (6s)
sub-diamond: 1d/10n (5s)
sub-diamond: 1d/10n (4s)
sub-diamond: 1d/10n (3s)
sub-diamond: 1d/10n (2s)
sub-diamond: 2d/6n (10s)
sub-diamond: 2d/6n (9s)
sub-diamond: 2d/6n (8s)
sub-diamond: 2d/6n (7s)
sub-diamond: 2d/6n (6s)
sub-diamond: 2d/8n (9s)
sub-diamond: 2d/8n (8s)
sub-diamond: 2d/8n (7s)
sub-diamond: 2d/8n (6s)
sub-diamond: 2d/8n (5s)
sub-neighbour: 1d/5n (7s)
sub-neighbour: 1d/5n (6s)
sub-neighbour: 1d/5n (5s)
sub-neighbour: 1d/5n (4s)
sub-neighbour: 1d/5n (3s)
sub-neighbour: 1d/10n (6s)
sub-neighbour: 1d/10n (5s)
sub-neighbour: 1d/10n (4s)
sub-neighbour: 1d/10n (3s)
sub-neighbour: 1d/10n (2s)
sub-neighbour: 2d/6n (10s)
sub-neighbour: 2d/6n (9s)
sub-neighbour: 2d/6n (8s)
sub-neighbour: 2d/6n (7s)
sub-neighbour: 2d/6n (6s)
sub-neighbour: 2d/8n (9s)
sub-neighbour: 2d/8n (8s)
sub-neighbour: 2d/8n (7s)
sub-neighbour: 2d/8n (6s)
sub-neighbour: 2d/8n (5s)
sub-precious: 1d/5n (7s)
sub-precious: 1d/5n (6s)
sub-precious: 1d/5n (5s)
sub-precious: 1d/5n (4s)
sub-precious: 1d/5n (3s)
sub-precious: 1d/10n (6s)
sub-precious: 1d/10n (5s)
sub-precious: 1d/10n (4s)
sub-precious: 1d/10n (3s)
sub-precious: 1d/10n (2s)
sub-precious: 2d/6n (10s)
sub-precious: 2d/6n (9s)
sub-precious: 2d/6n (8s)
sub-precious: 2d/6n (7s)
sub-precious: 2d/6n (6s)
sub-precious: 2d/8n (9s)
sub-precious: 2d/8n (8s)
sub-precious: 2d/8n (7s)
sub-precious: 2d/8n (6s)
sub-precious: 2d/8n (5s)
sub-fingers: 1d/5n (7s)
sub-fingers: 1d/5n (6s)
sub-fingers: 1d/5n (5s)
sub-fingers: 1d/5n (4s)
sub-fingers: 1d/5n (3s)
sub-fingers: 1d/10n (6s)
sub-fingers: 1d/10n (5s)
sub-fingers: 1d/10n (4s)
sub-fingers: 1d/10n (3s)
sub-fingers: 1d/10n (2s)
sub-fingers: 2d/6n (10s)
sub-fingers: 2d/6n (9s)
sub-fingers: 2d/6n (8s)
sub-fingers: 2d/6n (7s)
sub-fingers: 2d/6n (6s)
sub-fingers: 2d/8n (9s)
sub-fingers: 2d/8n (8s)
sub-fingers: 2d/8n (7s)
sub-fingers: 2d/8n (6s)
sub-fingers: 2d/8n (5s)
sub-diamond: 3d/5n (13s)
sub-diamond: 3d/5n (12s)
sub-diamond: 3d/5n (11s)
sub-diamond: 3d/5n (10s)
sub-diamond: 3d/5n (9s)
sub-neighbour: 3d/5n (13s)
sub-neighbour: 3d/5n (12s)
sub-neighbour: 3d/5n (11s)
sub-neighbour: 3d/5n (10s)
sub-neighbour: 3d/5n (9s)
sub-precious: 3d/5n (13s)
sub-precious: 3d/5n (12s)
sub-precious: 3d/5n (11s)
sub-precious: 3d/5n (10s)
sub-precious: 3d/5n (9s)
sub-fingers: 3d/5n (13s)
sub-fingers: 3d/5n (12s)
sub-fingers: 3d/5n (11s)
sub-fingers: 3d/5n (10s)
sub-fingers: 3d/5n (9s)