# Reusing a Previous or Existing Solution

Formulize attempts to identify models from scratch, however you can provide hints or a starting point for the search by entering pre-existing or related models. The option to enter these models is located in the Set Target View.

To enter a prior solution, type or copy and paste the expression into the prior solutions text box. Enter each prior solution on a separate line.

For example, to enter two prior solutions *y = (x - 1)* and *y = sin(2*x)*, enter the following text:

```
(x - 1)
sin(2*x)
```

When starting or resuming a search, seeded solutions are shown in the project log in the Start Search View. The confirmation message will look like:

```
6:24:53PM| Search started: y = f(x, w)
6:24:53PM| Seeding solution: y = x - 1
6:24:53PM| Seeding solution: y = sin(2*x)
```

# Complex Search Relations

Complex search relations that specify more than one formula for each solution must be entered differently. Each line must contain an expression for each ** f_{i}()** that appears in the Target Expression.

For example, if the search relation contains two formula such as *y = f0(x)*f1(x)*, and the prior the model is *y = (x-1)*sin(2*x)*, one would enter:

`f0 = (x-1), f1 = sin(2*x)`

Each ** f_{i}()** is listed with its sub-expression, each is separated by a comma, on the same line. To specify multiple prior models, enter each set of f's on a new line.