...,15618,+,15619,+,15620,15621,15622,+,x,+,x,+,x,+,x,15623,15624,15625,...
113864..............................................^

##</code><code>##

...,x,15630,x,15631,x,15632,x,15633,x,+,x,+,x
113952..................................^

##</code><code>##

ABCD+IJKL+ABCD+PQRS+ABCD+IJKL...

##</code><code>##

(ABCD*3)+(IJKL*2)+(PQRS*1)...