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It takes the variable x, however never uses it and instead just uses 5.
For clarity this is the solution provided
”’
Xmavg_price: {[X]
whereClause: () ; //enlisting JPM to keep as a symbol and not interpreted as a variable
byClause:enlist [
sym]!enlistsym;returnClause:enlist[
price_5]!enlist (mavg;5;price);?[trade;whereClause;byClause;returnClause]
}
Xmavg_price 5
”’